RE: rebuilding indexes - sure to cause a ruckus
not to mention running 48 batch jobs on a 8CPU box with all of them committing after every record and using the table to generate keys (Cary would love this one) ;) They wanted to find other reasons and he conveniently ignored the real problem. Beautiful... Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 12/16 Detroit, 1/27 Atlanta - SQL Optimization 101: 2/16 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Denny Koovakattu Sent: Friday, December 12, 2003 3:20 PM To: Multiple recipients of list ORACLE-L If it's from Oracle, I would believe it, i.e., I would believe somebody did actually say that ;) But it does not make it right. Now only if management knew/believed that. Some more from Oracle, - Oracle writes to one log member and then the other. So you need both log members for recovery. Volunteered to help us use _allow_resetlogs_corruption when we had one intact log member. (Took a lot of effort not to tell him to read the concepts manual. Was from a Sev1 problem that happened a few years ago.) - Increasing hit ratio, OS swap size to 3 times the OS memory and improving data proximity in an index (never really understood this one) among other bizarre ones to improve performance. This from an Oracle consultant who was called onsite by Development Management because we claimed the real reason was because the application was committing after every record to avoid locking issues on a table generating sequences, not to mention running 48 batch jobs on a 8CPU box with all of them committing after every record and using the table to generate keys (Cary would love this one) ;) They wanted to find other reasons and he conveniently ignored the real problem. BTW, I personally don't like having a zillion extents for an object (more so when you have multiple DBA Replacement Tools querying dba_extents constantly and showing flashing red lights) and would expect the development team NOT to give me a deer in the headlights look when asked for table sizing info. Response most often heard is Why do you need that. Oracle will be able to take care of it or can't Oracle take care of it or some variation thereof What I really want to say is if you don't have any idea about your data, then please don't write any SQL. That should take care of most performance issues. Barbara Baker wrote: You probably think you're joking. Unfortunately . . . We've been fighting with Oracle for several months about SEVERE performance degradation on an OpenVMS application after we upgraded the database to 8.1.7.4 One of Oracle's recommendations taken directly from our TAR just 2 weeks ago: o Ensure tables and indexes have as few extents as possible. sigh... Barb --- Bobak, Mark [EMAIL PROTECTED] wrote: I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Denny Koovakattu INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
You probably think you're joking. Unfortunately . . . We've been fighting with Oracle for several months about SEVERE performance degradation on an OpenVMS application after we upgraded the database to 8.1.7.4 One of Oracle's recommendations taken directly from our TAR just 2 weeks ago: o Ensure tables and indexes have as few extents as possible. sigh... Barb --- Bobak, Mark [EMAIL PROTECTED] wrote: I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark -Original Message- Sent: Wednesday, December 10, 2003 5:24 PM To: Multiple recipients of list ORACLE-L BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard Surely the Rocket Scientist version must be Hey, this is all quite easy, it sure ain't index rebuilding very evil grin Ciao Fuzzy :-) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Grant Allen INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Bobak, Mark INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). __ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Barbara Baker INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Ouch. Suddenly, it seems not so funny -Original Message- Sent: Friday, December 12, 2003 11:25 AM To: Multiple recipients of list ORACLE-L You probably think you're joking. Unfortunately . . . We've been fighting with Oracle for several months about SEVERE performance degradation on an OpenVMS application after we upgraded the database to 8.1.7.4 One of Oracle's recommendations taken directly from our TAR just 2 weeks ago: o Ensure tables and indexes have as few extents as possible. sigh... Barb --- Bobak, Mark [EMAIL PROTECTED] wrote: I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark -Original Message- Sent: Wednesday, December 10, 2003 5:24 PM To: Multiple recipients of list ORACLE-L BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard Surely the Rocket Scientist version must be Hey, this is all quite easy, it sure ain't index rebuilding very evil grin Ciao Fuzzy :-) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Grant Allen INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Bobak, Mark INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). __ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Barbara Baker INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Bobak, Mark INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
If it's from Oracle, I would believe it, i.e., I would believe somebody did actually say that ;) But it does not make it right. Now only if management knew/believed that. Some more from Oracle, - Oracle writes to one log member and then the other. So you need both log members for recovery. Volunteered to help us use _allow_resetlogs_corruption when we had one intact log member. (Took a lot of effort not to tell him to read the concepts manual. Was from a Sev1 problem that happened a few years ago.) - Increasing hit ratio, OS swap size to 3 times the OS memory and improving data proximity in an index (never really understood this one) among other bizarre ones to improve performance. This from an Oracle consultant who was called onsite by Development Management because we claimed the real reason was because the application was committing after every record to avoid locking issues on a table generating sequences, not to mention running 48 batch jobs on a 8CPU box with all of them committing after every record and using the table to generate keys (Cary would love this one) ;) They wanted to find other reasons and he conveniently ignored the real problem. BTW, I personally don't like having a zillion extents for an object (more so when you have multiple DBA Replacement Tools querying dba_extents constantly and showing flashing red lights) and would expect the development team NOT to give me a deer in the headlights look when asked for table sizing info. Response most often heard is Why do you need that. Oracle will be able to take care of it or can't Oracle take care of it or some variation thereof What I really want to say is if you don't have any idea about your data, then please don't write any SQL. That should take care of most performance issues. Barbara Baker wrote: You probably think you're joking. Unfortunately . . . We've been fighting with Oracle for several months about SEVERE performance degradation on an OpenVMS application after we upgraded the database to 8.1.7.4 One of Oracle's recommendations taken directly from our TAR just 2 weeks ago: o Ensure tables and indexes have as few extents as possible. sigh... Barb --- Bobak, Mark [EMAIL PROTECTED] wrote: I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Denny Koovakattu INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Can we, please, change terminology and use the term log file instead of log member. I distinctly remember backup recovery class in NYC when a guy with a heavy accent popped the following question: Can I recover the database if I lose my member? It was the time after lunch while we were all drinking sodas in the lobby. I distinctly remember the feeling of diet coke coming out of my nostrils. It wasn't pleasant. On 12/12/2003 04:19:33 PM, Denny Koovakattu wrote: If it's from Oracle, I would believe it, i.e., I would believe somebody did actually say that ;) But it does not make it right. Now only if management knew/believed that. Some more from Oracle, - Oracle writes to one log member and then the other. So you need both log members for recovery. Volunteered to help us use _allow_resetlogs_corruption when we had one intact log member. (Took a lot of effort not to tell him to read the concepts manual. Was from a Sev1 problem that happened a few years ago.) - Increasing hit ratio, OS swap size to 3 times the OS memory and improving data proximity in an index (never really understood this one) among other bizarre ones to improve performance. This from an Oracle consultant who was called onsite by Development Management because we claimed the real reason was because the application was committing after every record to avoid locking issues on a table generating sequences, not to mention running 48 batch jobs on a 8CPU box with all of them committing after every record and using the table to generate keys (Cary would love this one) ;) They wanted to find other reasons and he conveniently ignored the real problem. BTW, I personally don't like having a zillion extents for an object (more so when you have multiple DBA Replacement Tools querying dba_extents constantly and showing flashing red lights) and would expect the development team NOT to give me a deer in the headlights look when asked for table sizing info. Response most often heard is Why do you need that. Oracle will be able to take care of it or can't Oracle take care of it or some variation thereof What I really want to say is if you don't have any idea about your data, then please don't write any SQL. That should take care of most performance issues. Barbara Baker wrote: You probably think you're joking. Unfortunately . . . We've been fighting with Oracle for several months about SEVERE performance degradation on an OpenVMS application after we upgraded the database to 8.1.7.4 One of Oracle's recommendations taken directly from our TAR just 2 weeks ago: o Ensure tables and indexes have as few extents as possible. sigh... Barb --- Bobak, Mark [EMAIL PROTECTED] wrote: I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Denny Koovakattu INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Mladen Gogala Oracle DBA -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mladen Gogala INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Mark, I just met Elvis behind local Wal-Mart parking lot, we discussed the same topics ... funny you mention them. Oh ans we did talk about investing in Enron too (got a hot tip, the stock is going to go up). Raj Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art ! -Original Message- Sent: Wednesday, December 10, 2003 5:39 PM To: Multiple recipients of list ORACLE-L I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark ** This e-mail message is confidential, intended only for the named recipient(s) above and may contain information that is privileged, attorney work product or exempt from disclosure under applicable law. If you have received this message in error, or are not the named recipient(s), please immediately notify corporate MIS at (860) 766-2000 and delete this e-mail message from your computer, Thank you. **4 -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jamadagni, Rajendra INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Thanks Raj, Unfortunately, in my rush to get the kids to school in time, I stuffed the formatting when my cut 'n' pasting got converted to plain text. Hope you found it all useful. Cheers Richard - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Wednesday, December 10, 2003 2:49 AM Richard's explanation and example from c.d.o.s now has a permanent tinyurl link ... http://tinyurl.com/yflq if anyone is interested ... this might be better for bookmarks. Raj -- -- Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art ! -Original Message- Sent: Monday, December 08, 2003 4:29 PM To: Multiple recipients of list ORACLE-L Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. [ rest snipped ] ** This e-mail message is confidential, intended only for the named recipient(s) above and may contain information that is privileged, attorney work product or exempt from disclosure under applicable law. If you have received this message in error, or are not the named recipient(s), please immediately notify corporate MIS at (860) 766-2000 and delete this e-mail message from your computer, Thank you. **5 -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jamadagni, Rajendra INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Hi Yong, One thing I should have mentioned when I posted my epic is that it not only attempts to correct the numerous technical errors in the article but also attempts to answer the various questions the article raises but totally fails to address. What I find most astonishing about the article is that the author confesses at the conclusion he has no idea when and why an index rebuild is beneficial. And as the author doesn't know, then surely it must all be so difficult, a scientific-less phenomenon. If I can convince anyone who makes it through my email that this isn't rocket science, then it's been worth the bandwidth. BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Wednesday, December 10, 2003 5:44 AM Thanks, Richard. I'll read your long message more carefully later. I like your statement that rebuilding an index or not is not rocket science. One needs to measure the performance before and after the rebuild and make a conclusion himself. Many times we discuss performance issues and get very technical and sophisticated, without showing experimental results! Having been a science researcher before, I'd like to emphasize that facts speak louder than theories. There may be 10,000 24x7 databases in the world that don't easily allow even testing an index rebuild. But there may be 100 times more production databases in the world that are not 24x7. The individual DBA needs to do his control study and conclude, using experts' opinions as reference. Yong Huang __ Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Yong Huang INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Richard: I think that is the simple way of questioning other person's capacity. Remember this statment (borrowed from some one !!) If you are telling something is simple, you are questioning the other person's intelligence !!' KG -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: K Gopalakrishnan INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Richard, I found it immensely useful, that's why I created the tinyurl and went to c.d.o.s and read the whole thread, from first to last post. (man those people need to learn to weed out old comments in the replies). This is what I love about this forum, it comes with huge amount of knowledge, eager members who are ready to educate and learn, add a dash of rhetoric and a right amount of fun. In other words a perfect combination. Thanks for your explanation. Raj Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art ! -Original Message- Sent: Wednesday, December 10, 2003 4:15 AM To: Multiple recipients of list ORACLE-L Thanks Raj, Unfortunately, in my rush to get the kids to school in time, I stuffed the formatting when my cut 'n' pasting got converted to plain text. Hope you found it all useful. Cheers Richard ** This e-mail message is confidential, intended only for the named recipient(s) above and may contain information that is privileged, attorney work product or exempt from disclosure under applicable law. If you have received this message in error, or are not the named recipient(s), please immediately notify corporate MIS at (860) 766-2000 and delete this e-mail message from your computer, Thank you. **4 -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jamadagni, Rajendra INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
OT Re: Re: rebuilding indexes - sure to cause a ruckus
Hi Richard, I think, there are 2 candidates for an answer. 1life (nothing is more difficult) 2...love (ever tried to read your madam's thoughts?) ;-) Corrections welcome (as always). Cheers, Guido [EMAIL PROTECTED] 10.12.2003 11.39 Uhr (snip) If I can convince anyone who makes it through my email that this isn't rocket science, then it's been worth the bandwidth. BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Guido Konsolke INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Terse ? You haven't heard me terse until youhear me trying to get the kids to sleep at night. Don got it easy ;) - Original Message - From: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L Sent: Wednesday, December 10, 2003 8:14 AM Subject: Re: rebuilding indexes - sure to cause a ruckus And in case you miss it in Richard's terse message, one of the big reasons that it is not 'rocket science' is that you can perform operations that modify the index(es), and perform block dumps of the index as you go. You can see exactly what Oracle is doing with the index. Jared Yong Huang [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 12/09/2003 11:44 AM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:Re: rebuilding indexes - sure to cause a ruckusThanks, Richard. I'll read your long message more carefully later. I like yourstatement that rebuilding an index or not is not rocket science. One needs tomeasure the performance before and after the rebuild and make a conclusionhimself. Many times we discuss performance issues and get very technical andsophisticated, without showing experimental results! Having been a scienceresearcher before, I'd like to emphasize that facts speak louder than theories.There may be 10,000 24x7 databases in the world that don't easily allow eventesting an index rebuild. But there may be 100 times more production databasesin the world that are not 24x7. The individual DBA needs to do his controlstudy and conclude, using experts' opinions as reference.Yong Huang__Do you Yahoo!?New Yahoo! Photos - easier uploading and sharing.http://photos.yahoo.com/-- Please see the official ORACLE-L FAQ: http://www.orafaq.net-- Author: Yong HuangINET: [EMAIL PROTECTED]Fat City Network Services -- 858-538-5051 http://www.fatcity.comSan Diego, California -- Mailing list and web hosting services-To REMOVE yourself from this mailing list, send an E-Mail messageto: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and inthe message BODY, include a line containing: UNSUB ORACLE-L(or the name of mailing list you want to be removed from). You mayalso send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Hi KG, O, you've got me thinking here !! I'm not too sure that I've really questioned anyone's intelligence. I've always measured someone's intelligence by: 1. How quickly the can learn and absorb new information 2. How much they know and appreciate the work of David Bowie A quick check of the Oxford Dictionary describes the word intelligence as mental ability to learn and understand things (although interestingly, there's no mention of DB). I guess the issue I have is that if intelligent people are told and feed incorrect information (and Don's article has it's share of incorrect information) then fundamentally it's one's knowledge that I begin questioning. Unfortunately, I believe there are a lot of intelligent people in the Oracle community who have a questionable knowledge of Oracle (or aspects of Oracle) as a direct result of the poor quality of information that people absorb (be it books, training courses, web-articles, etc..). And undoubtedly many of these people that write substandard materials in turn have picked up flawed knowledge due to the quality of their readings, education and lack of proper research. As I mentioned Knowledge is the key that unlocks the door of doubt. If you have no doubts about something, it by definition becomes simple !! Unfortunately, if you're presented with the wrong information, you get access to the wrong key ;) Cheers Richard - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Wednesday, December 10, 2003 10:09 PM Richard: I think that is the simple way of questioning other person's capacity. Remember this statment (borrowed from some one !!) If you are telling something is simple, you are questioning the other person's intelligence !!' KG -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: K Gopalakrishnan INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Richard Foote scribbled on the wall in glitter crayon: BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? the only two i know use theoretical physics.;-) -- Bill Shrek Thater ORACLE DBA I'm going to work my ticket if I can... -- Gilwell song [EMAIL PROTECTED] Nothing can move faster than light. - Albert Einstein -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Thater, William INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard Surely the Rocket Scientist version must be Hey, this is all quite easy, it sure ain't index rebuilding very evil grin Ciao Fuzzy :-) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Grant Allen INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
LOL, This made me think of the Simpson's Halloween episode where Monty Burns says, 'Smithers, this isn't rocket science, its brain surgery'. - Alan Davey Senior Analyst/Project Leader Oracle 9i OCA; 3/4 OCP w) 973.267.5990 x458 w) 212.295.3458 -Original Message- Sent: Wednesday, December 10, 2003 5:24 PM To: Multiple recipients of list ORACLE-L BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard Surely the Rocket Scientist version must be Hey, this is all quite easy, it sure ain't index rebuilding very evil grin Ciao Fuzzy :-) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Grant Allen INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). This information in this e-mail is intended solely for the addressee and may contain information which is confidential or privileged. Access to this e-mail by anyone else is unauthorized. If you are not the intended recipient, or believe that you have received this communication in error, please do not print, copy, retransmit, disseminate, or otherwise use the information. Also, please notify the sender that you have received this e-mail in error, and delete the copy you received. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Davey, Alan INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark -Original Message- Sent: Wednesday, December 10, 2003 5:24 PM To: Multiple recipients of list ORACLE-L BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard Surely the Rocket Scientist version must be Hey, this is all quite easy, it sure ain't index rebuilding very evil grin Ciao Fuzzy :-) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Grant Allen INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Bobak, Mark INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
How about: Keep re-analyzing your tables and indexes. Run gather_statistics (or whatever) all the time. Bobak, Mark wrote: I think this subject has been done to death. We should talk about less contentious issues such as: - The buffer cache hit ratio, your friend in expert Oracle tuning! - Rebuild your tables regularly to reduce the number of extents and improve performance! - Disk access is at least 10,000x slower than memory, to tune your database, eliminate physical I/O! Anyone else got and good ones? ;-) -Mark -Original Message- Sent: Wednesday, December 10, 2003 5:24 PM To: Multiple recipients of list ORACLE-L BTW, does anyone know what a rocket scientist refers to when they say Hey, this is all quite easy, it sure ain't ? ? Cheers ;) Richard Surely the Rocket Scientist version must be Hey, this is all quite easy, it sure ain't index rebuilding very evil grin Ciao Fuzzy :-) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: =?ISO-8859-1?Q?Mogens_N=F8rgaard?= INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Hi Tanel, I recommend a strong cup of coffee and a small nap 1/2 way through ;) - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Tuesday, December 09, 2003 7:44 AM Ouch, I gotta take a day off to read this one ;) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Hi Paul, The long one includes a discussion on why you should generally coalesce rather than rebuild indexes ;) Cheers Richard - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Tuesday, December 09, 2003 8:44 AM somewhat on the longish side??? I'd hate to see a long article! ;-) --- Richard Foote [EMAIL PROTECTED] wrote: Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. In part, these are some of the issues I raised directly with Don in a number of emails (warning somewhat on the longish side ;): __ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Paul Baumgartel INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Hi Steve, I agree completely, but the question is would you rebuild it afterwards ? Cheers ;-) - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Tuesday, December 09, 2003 9:29 AM I think it needs an index. ;-) -Original Message- Paul Baumgartel Sent: Monday, December 08, 2003 3:44 PM To: Multiple recipients of list ORACLE-L somewhat on the longish side??? I'd hate to see a long article! ;-) --- Richard Foote [EMAIL PROTECTED] wrote: Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. In part, these are some of the issues I raised directly with Don in a number of emails (warning somewhat on the longish side ;): -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Orr, Steve INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
This message's a keeper! Thanks! :) Rich Rich Jesse System/Database Administrator [EMAIL PROTECTED] Quad/Tech Inc, Sussex, WI USA -Original Message- Sent: Monday, December 08, 2003 3:29 PM To: Multiple recipients of list ORACLE-L Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. [truncate drop storage] -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jesse, Rich INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Richard's explanation and example from c.d.o.s now has a permanent tinyurl link ... http://tinyurl.com/yflq if anyone is interested ... this might be better for bookmarks. Raj Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art ! -Original Message- Sent: Monday, December 08, 2003 4:29 PM To: Multiple recipients of list ORACLE-L Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. [ rest snipped ] ** This e-mail message is confidential, intended only for the named recipient(s) above and may contain information that is privileged, attorney work product or exempt from disclosure under applicable law. If you have received this message in error, or are not the named recipient(s), please immediately notify corporate MIS at (860) 766-2000 and delete this e-mail message from your computer, Thank you. **5 -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jamadagni, Rajendra INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
What sort of Oak Table member are you, Richard? Any Oak Table member worth their weight in toilet paper would certainly execute DBMS_POWERNAP part way through, but the strong cup of coffee definitely needs a large shot of whiskey substituted for it! :) Pete Controlling developers is like herding cats. Kevin Loney, Oracle DBA Handbook Oh no, it's not. It's much harder than that! Bruce Pihlamae, long-term Oracle DBA -Original Message- Richard Foote Sent: Tuesday, December 09, 2003 7:35 PM To: Multiple recipients of list ORACLE-L Hi Tanel, I recommend a strong cup of coffee and a small nap 1/2 way through ;) - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Tuesday, December 09, 2003 7:44 AM Ouch, I gotta take a day off to read this one ;) -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Richard Foote INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Pete Sharman INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Thanks, Richard. I'll read your long message more carefully later. I like your statement that rebuilding an index or not is not rocket science. One needs to measure the performance before and after the rebuild and make a conclusion himself. Many times we discuss performance issues and get very technical and sophisticated, without showing experimental results! Having been a science researcher before, I'd like to emphasize that facts speak louder than theories. There may be 10,000 24x7 databases in the world that don't easily allow even testing an index rebuild. But there may be 100 times more production databases in the world that are not 24x7. The individual DBA needs to do his control study and conclude, using experts' opinions as reference. Yong Huang __ Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Yong Huang INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
And in case you miss it in Richard's terse message, one of the big reasons that it is not 'rocket science' is that you can perform operations that modify the index(es), and perform block dumps of the index as you go. You can see exactly what Oracle is doing with the index. Jared Yong Huang [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 12/09/2003 11:44 AM Please respond to ORACLE-L To:Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:Re: rebuilding indexes - sure to cause a ruckus Thanks, Richard. I'll read your long message more carefully later. I like your statement that rebuilding an index or not is not rocket science. One needs to measure the performance before and after the rebuild and make a conclusion himself. Many times we discuss performance issues and get very technical and sophisticated, without showing experimental results! Having been a science researcher before, I'd like to emphasize that facts speak louder than theories. There may be 10,000 24x7 databases in the world that don't easily allow even testing an index rebuild. But there may be 100 times more production databases in the world that are not 24x7. The individual DBA needs to do his control study and conclude, using experts' opinions as reference. Yong Huang __ Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Yong Huang INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Science is the belief in the ignorance of experts. --Richard Feynman Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Performance Diagnosis 101: 12/16 Detroit, 1/27 Atlanta - SQL Optimization 101: 12/8 Dallas, 2/16 Dallas - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details... -Original Message- Yong Huang Sent: Tuesday, December 09, 2003 1:45 PM To: Multiple recipients of list ORACLE-L Thanks, Richard. I'll read your long message more carefully later. I like your statement that rebuilding an index or not is not rocket science. One needs to measure the performance before and after the rebuild and make a conclusion himself. Many times we discuss performance issues and get very technical and sophisticated, without showing experimental results! Having been a science researcher before, I'd like to emphasize that facts speak louder than theories. There may be 10,000 24x7 databases in the world that don't easily allow even testing an index rebuild. But there may be 100 times more production databases in the world that are not 24x7. The individual DBA needs to do his control study and conclude, using experts' opinions as reference. Yong Huang __ Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Yong Huang INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Cary Millsap INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Shh!! Nonsense! It's all black magic and conjecture! How else are we going to be highly paid Oracle consultants, if everyone knows all this stuff is provable and demonstrable?? ;-) -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]Sent: Tuesday, December 09, 2003 5:15 PMTo: Multiple recipients of list ORACLE-LSubject: Re: rebuilding indexes - sure to cause a ruckusAnd in case you miss it in Richard's terse message, one of the big reasons that it is not 'rocket science' is that you can perform operations that modify the index(es), and perform block dumps of the index as you go. You can see exactly what Oracle is doing with the index. Jared Yong Huang [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 12/09/2003 11:44 AM Please respond to ORACLE-L To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] cc: Subject:Re: rebuilding indexes - sure to cause a ruckusThanks, Richard. I'll read your long message more carefully later. I like yourstatement that rebuilding an index or not is not rocket science. One needs tomeasure the performance before and after the rebuild and make a conclusionhimself. Many times we discuss performance issues and get very technical andsophisticated, without showing experimental results! Having been a scienceresearcher before, I'd like to emphasize that facts speak louder than theories.There may be 10,000 24x7 databases in the world that don't easily allow eventesting an index rebuild. But there may be 100 times more production databasesin the world that are not 24x7. The individual DBA needs to do his controlstudy and conclude, using experts' opinions as reference.Yong Huang__Do you Yahoo!?New Yahoo! Photos - easier uploading and sharing.http://photos.yahoo.com/-- Please see the official ORACLE-L FAQ: http://www.orafaq.net-- Author: Yong HuangINET: [EMAIL PROTECTED]Fat City Network Services -- 858-538-5051 http://www.fatcity.comSan Diego, California -- Mailing list and web hosting services-To REMOVE yourself from this mailing list, send an E-Mail messageto: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and inthe message BODY, include a line containing: UNSUB ORACLE-L(or the name of mailing list you want to be removed from). You mayalso send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Hi! Yes Yong I agree with you, that rebuilding may be beneficial in some cases, especially some tables/indexes become either logically or physically read only (btw, I was not speaking about coalescing in my post, it's a different story anyway). But the point I wanted to make is that single query's speed (LIO amount) right after rebuilding index doesn't usually give us enough information to determine whether overall system speed will go better in long term. When you have rebuilt an index, it becomes more compact, causing more recursive operations for block splits and perhaps index height changes in the future. Also, in heavily loaded 24x7 environments with no real low-peak time, the additional CPU, IO and brief exclusive lock usage may cause more harm than it gives benefit. And often this benefit is only short term in regular OLTP systems. But in some cases, as when you've deleted a number of rows from your table or done a lot of updates and you never expect these keys to be back in the index, a rebuild can be justified. Tanel. - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Friday, December 05, 2003 10:29 PM Tanel, I think you're saying a query almost always runs faster right after the index rebuild and there's no point in finding the criterion whether to rebuild an index. (What is 42?) Some time ago I posted a message somewhere else showing a case where rebuilding or coalescing an index may be benefitial. A data warehouse is found to have some data errors. Deletes and updates are done. Then the database goes to mostly read-only again, and will last for a month or quarter. Then shrinking frequently used B*Tree indexes is a good idea. Now I'd like to add one more criterion as a result of reading Jonathan Lewis' dbazine article and email with him (errors are mine): the index is full scanned, or if range scanned or unique scanned, the index selectivity has to be fairly low (but not too low for the index to be ignored by CBO). In a typical working environment, a data warehouse does have plenty of relatively quiet period. I worked on a monthly data load project at an insurance company. I remember we rebuilt a partitioned IOT (one partition at a time) and fast full index scan (certain partitions) did run faster. There're some errors in Don Burleson's dbazine article (e.g. pct_used in dba_indexes) and Mike Hordila's Oramag article (structurally unbalanced index). But one thing alluded to in there is important: study Oracle performance problems as scientific research. You said setting _wait_for_sync to false improves performance. That's a fact. We can only explain and analyze it but not deny it. Similarly, when Mike says queries run 10 to 50% faster after index rebuild, we can't deny unless we find his measurement is wrong. Wouldn't it be nice if Oracle researchers write articles with sections like Abstract - Experimental - Results - Discussion in that order? Yong Huang Tanel Poder wrote: There's no point of arguing about whether a query ran faster right after you rebuilt your index. Nor there is no point in finding some ultimate algorithm for finding the point of index rebuilding, we all know the answer - it's 42. Instead, a long stress test has to be done, e.g. running 10 millions of continous transactions and queries (simulating real life). Do one 10M without rebuilding indexes in the meantime, measure total execution time, IO amount, CPU usage, segment sizes etc. Then restore your database back to starting point and do the same test again with regular index rebuilds during the operations (online or taking users offline, depending on environment type). And then measure the same statistics, especially total execution time. Note, that statistics and time also for rebuilding indexes should be accounted in totals, because in real life they don't just disappear somewhere as in some simple-minded tests. Tanel. __ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Yong Huang INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Tanel Poder INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web
Re: rebuilding indexes - sure to cause a ruckus
Ouch, I gotta take a day off to read this one ;) Tanel. - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Monday, December 08, 2003 11:29 PM Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. In part, these are some of the issues I raised directly with Don in a number of emails (warning somewhat on the longish side ;): a.. There are no such things as star indexes. Star joins, yes, star transformations yes, but not star indexes ? b.. I still disagree with your description of b-tree indexes being complex and difficult to understand, but then again this could just be my personal perception (check out http://groups.google.com/groups?q=g:thl3498916429ddq=hl=enlr=ie=UTF-8se lm=ant%259.39604%24jM5.100537%40newsfeeds.bigpond.comrnum=47 where I have a sample demo on how to investigate the workings of b-tree indexes.) However, by understanding them and a how they function, the question of whether or not they need rebuilding no longer needs to be debated. It becomes easily apparent under what conditions indexes could benefit from a rebuild. I'll expand on this later but I would suggest those that debate, those that really don't know when a rebuild is justified and just rebuild in the hope it might do some good are those that really don't understand how indexes function. Knowledge is the key that unlocks the door of doubt and those without the key fumble aimlessly and prod around in hope... c.. Your subsequent quote There is enough anecdotal evidence that index rebuilding has helped some systems perform better, and I also have no doubt that there is no scientific basis for the claim is a nonsense. Of course one explain in scientific terms such performance improvements, I can only suggest that you unfortunately can't. Oracle is not some magic piece of software and it doesn't run on some magical pieces of hardware. Any suggestions to the contrary are not helpful to anyone. d.. I still disagree with the double the block size, halving the logical reads must be a good thing argument. It's a path that could lead to a very disappointing conclusion (read cliff edge). Indexes prefer large block sizes true but if the underlining storage file-system is not tuned to read (or write) these larger block sizes efficiently, then the whole thing is counter productive. You've been warned ... e.. Your description of PCTUSED is still wrong. There is no PCTUSED for indexes so it really shouldn't be misleading to confuse a non-existing index attribute with the amount of used space as documented in INDEX_STATS... f.. Including in your criteria for rebuilding an index btree_space being greater than a block is redundant when listed with the other criteria. It is fundamentally impossible for an index with 4 levels or more to consist of a single block, so why mention it. It just adds confusion and is silly. The DBA who swears by this criteria (which I noticed has changed in this draft ;), how do they make such a claim? It's one thing to swear, it's quite another to prove. Your table that lists average rows and blocks per different index levels shows that those indexes with a leaf row length of 500,000,000 and with 100,000 blocks require 4 levels. How does rebuilding such indexes with no subsequent change in index level improve performance ? I mean, large indexes need more levels right, so rebuilding them all the time and keeping the levels unchanged only to rebuild them again because they're still 4 or more levels seems like a pointless, never-ending exercise in futility. To rebuild an index that actually results in a reduction in it's level generally requires a drastic reduction in it's data volume due to the orders of sizing magnitude that a new level represents. More on this and the other so-called rebuild criteria later but the current level of an index is not a criteria for a rebuild. A level 3 index could conceivably be rebuilt to just a level 1 (if there were heaps and heaps of deletions) and a level 5 index could be rebuilt to stay at level 5. Which index has benefited . g.. Criteria for a rebuild: or the total length of deleted is 1 block makes no sense whatsoever. Nearly all indexes would have a total length of deleted than 1 block meaning nearly all indexes need rebuilding. I don't think so ... h.. Your discussion on the clustering factor affecting the likelihood of requiring an index rebuild is still flawed, however interestingly, you've now given an example on why this is the case. However, you've still come to the wrong conclusion !! Firstly, you're incorrect in your example to say that a 1,000,000 row table with a clustering factor of 1,000,000 has it's rows in the same order as it's index although I guess this could be a typo. Regardless, if you delete all last_name beginning with a K, you are going to delete consecutive leaf nodes
Re: rebuilding indexes - sure to cause a ruckus
Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. In part, these are some of the issues I raised directly with Don in a number of emails (warning somewhat on the longish side ;): a.. There are no such things as star indexes. Star joins, yes, star transformations yes, but not star indexes ? b.. I still disagree with your description of b-tree indexes being complex and difficult to understand, but then again this could just be my personal perception (check out http://groups.google.com/groups?q=g:thl3498916429ddq=hl=enlr=ie=UTF-8se lm=ant%259.39604%24jM5.100537%40newsfeeds.bigpond.comrnum=47 where I have a sample demo on how to investigate the workings of b-tree indexes.) However, by understanding them and a how they function, the question of whether or not they need rebuilding no longer needs to be debated. It becomes easily apparent under what conditions indexes could benefit from a rebuild. I'll expand on this later but I would suggest those that debate, those that really don't know when a rebuild is justified and just rebuild in the hope it might do some good are those that really don't understand how indexes function. Knowledge is the key that unlocks the door of doubt and those without the key fumble aimlessly and prod around in hope... c.. Your subsequent quote There is enough anecdotal evidence that index rebuilding has helped some systems perform better, and I also have no doubt that there is no scientific basis for the claim is a nonsense. Of course one explain in scientific terms such performance improvements, I can only suggest that you unfortunately can't. Oracle is not some magic piece of software and it doesn't run on some magical pieces of hardware. Any suggestions to the contrary are not helpful to anyone. d.. I still disagree with the double the block size, halving the logical reads must be a good thing argument. It's a path that could lead to a very disappointing conclusion (read cliff edge). Indexes prefer large block sizes true but if the underlining storage file-system is not tuned to read (or write) these larger block sizes efficiently, then the whole thing is counter productive. You've been warned ... e.. Your description of PCTUSED is still wrong. There is no PCTUSED for indexes so it really shouldn't be misleading to confuse a non-existing index attribute with the amount of used space as documented in INDEX_STATS... f.. Including in your criteria for rebuilding an index btree_space being greater than a block is redundant when listed with the other criteria. It is fundamentally impossible for an index with 4 levels or more to consist of a single block, so why mention it. It just adds confusion and is silly. The DBA who swears by this criteria (which I noticed has changed in this draft ;), how do they make such a claim? It's one thing to swear, it's quite another to prove. Your table that lists average rows and blocks per different index levels shows that those indexes with a leaf row length of 500,000,000 and with 100,000 blocks require 4 levels. How does rebuilding such indexes with no subsequent change in index level improve performance ? I mean, large indexes need more levels right, so rebuilding them all the time and keeping the levels unchanged only to rebuild them again because they're still 4 or more levels seems like a pointless, never-ending exercise in futility. To rebuild an index that actually results in a reduction in it's level generally requires a drastic reduction in it's data volume due to the orders of sizing magnitude that a new level represents. More on this and the other so-called rebuild criteria later but the current level of an index is not a criteria for a rebuild. A level 3 index could conceivably be rebuilt to just a level 1 (if there were heaps and heaps of deletions) and a level 5 index could be rebuilt to stay at level 5. Which index has benefited . g.. Criteria for a rebuild: or the total length of deleted is 1 block makes no sense whatsoever. Nearly all indexes would have a total length of deleted than 1 block meaning nearly all indexes need rebuilding. I don't think so ... h.. Your discussion on the clustering factor affecting the likelihood of requiring an index rebuild is still flawed, however interestingly, you've now given an example on why this is the case. However, you've still come to the wrong conclusion !! Firstly, you're incorrect in your example to say that a 1,000,000 row table with a clustering factor of 1,000,000 has it's rows in the same order as it's index although I guess this could be a typo. Regardless, if you delete all last_name beginning with a K, you are going to delete consecutive leaf nodes regardless of the clustering factor. So what difference does it make to the index. None. To the table, yes, you either delete rows from all differing blocks or rows from a small number of blocks but to the index, it makes no difference, hence your claim makes no
Re: rebuilding indexes - sure to cause a ruckus
Tanel Poder wrote: Ouch, I gotta take a day off to read this one ;) http://www.netmeister.org/news/learn2quote.html It's all about optimization... -- Vladimir Begun The statements and opinions expressed here are my own and do not necessarily represent those of Oracle Corporation. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Vladimir Begun INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
somewhat on the longish side??? I'd hate to see a long article! ;-) --- Richard Foote [EMAIL PROTECTED] wrote: Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. In part, these are some of the issues I raised directly with Don in a number of emails (warning somewhat on the longish side ;): __ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Paul Baumgartel INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
I think it needs an index. ;-) -Original Message- Paul Baumgartel Sent: Monday, December 08, 2003 3:44 PM To: Multiple recipients of list ORACLE-L somewhat on the longish side??? I'd hate to see a long article! ;-) --- Richard Foote [EMAIL PROTECTED] wrote: Hi Yong, Saying there are a few errors is being a little kind to Don's Inside Oracle Indexing article. In part, these are some of the issues I raised directly with Don in a number of emails (warning somewhat on the longish side ;): -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Orr, Steve INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Tanel, I think you're saying a query almost always runs faster right after the index rebuild and there's no point in finding the criterion whether to rebuild an index. (What is 42?) Some time ago I posted a message somewhere else showing a case where rebuilding or coalescing an index may be benefitial. A data warehouse is found to have some data errors. Deletes and updates are done. Then the database goes to mostly read-only again, and will last for a month or quarter. Then shrinking frequently used B*Tree indexes is a good idea. Now I'd like to add one more criterion as a result of reading Jonathan Lewis' dbazine article and email with him (errors are mine): the index is full scanned, or if range scanned or unique scanned, the index selectivity has to be fairly low (but not too low for the index to be ignored by CBO). In a typical working environment, a data warehouse does have plenty of relatively quiet period. I worked on a monthly data load project at an insurance company. I remember we rebuilt a partitioned IOT (one partition at a time) and fast full index scan (certain partitions) did run faster. There're some errors in Don Burleson's dbazine article (e.g. pct_used in dba_indexes) and Mike Hordila's Oramag article (structurally unbalanced index). But one thing alluded to in there is important: study Oracle performance problems as scientific research. You said setting _wait_for_sync to false improves performance. That's a fact. We can only explain and analyze it but not deny it. Similarly, when Mike says queries run 10 to 50% faster after index rebuild, we can't deny unless we find his measurement is wrong. Wouldn't it be nice if Oracle researchers write articles with sections like Abstract - Experimental - Results - Discussion in that order? Yong Huang Tanel Poder wrote: There's no point of arguing about whether a query ran faster right after you rebuilt your index. Nor there is no point in finding some ultimate algorithm for finding the point of index rebuilding, we all know the answer - it's 42. Instead, a long stress test has to be done, e.g. running 10 millions of continous transactions and queries (simulating real life). Do one 10M without rebuilding indexes in the meantime, measure total execution time, IO amount, CPU usage, segment sizes etc. Then restore your database back to starting point and do the same test again with regular index rebuilds during the operations (online or taking users offline, depending on environment type). And then measure the same statistics, especially total execution time. Note, that statistics and time also for rebuilding indexes should be accounted in totals, because in real life they don't just disappear somewhere as in some simple-minded tests. Tanel. __ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Yong Huang INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
rebuilding indexes - sure to cause a ruckus
http://www.dbazine.com/burleson18.shtml
RE: rebuilding indexes - sure to cause a ruckus
Wow. We've got a lot of indexes to rebuild... :) Seems like those criteria have been beaten up on this list before. Rich Rich Jesse System/Database Administrator [EMAIL PROTECTED] Quad/Tech Inc, Sussex, WI USA -Original Message- Sent: Thursday, December 04, 2003 1:55 PM To: Multiple recipients of list ORACLE-L http://www.dbazine.com/burleson18.shtml -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jesse, Rich INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
There's no point of arguing about whether a query ran faster right after you rebuilt your index. Nor there is no point in finding some ultimate algorithm for finding the point of index rebuilding, we all know the answer - it's 42. Instead, a long stress test has to be done, e.g. running 10 millions of continous transactions and queries (simulating real life). Do one 10M without rebuilding indexes in the meantime, measure total execution time, IO amount, CPU usage, segment sizes etc. Then restore your database back to starting point and do the same test again with regular index rebuilds during the operations (online or taking users offline, depending on environment type). And then measure the same statistics, especially total execution time. Note, that statistics and time also for rebuilding indexes should be accounted in totals, because in real life they don't just disappear somewhere as in some simple-minded tests. Tanel. - Original Message - To: Multiple recipients of list ORACLE-L Sent: Thursday, December 04, 2003 9:54 PM http://www.dbazine.com/burleson18.shtml -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Tanel Poder INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: rebuilding indexes - sure to cause a ruckus
Thanks, Added this one to my bookmarks along with http://www.oracle.com/oramag/webcolumns/2001/index.html?auto_index.html and http://www.dba-oracle.com/art_index1.htm Sten ;) -Original Message- [EMAIL PROTECTED] Sent: Thursday, December 04, 2003 11:55 AM To: Multiple recipients of list ORACLE-L http://www.dbazine.com/burleson18.shtml -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Rognes, Sten INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: rebuilding indexes - sure to cause a ruckus
Comments in-line Regards Jonathan Lewis http://www.jlcomp.demon.co.uk The educated person is not the person who can answer the questions, but the person who can question the answers -- T. Schick Jr One-day tutorials: http://www.jlcomp.demon.co.uk/tutorial.html Three-day seminar: see http://www.jlcomp.demon.co.uk/seminar.html UK___November The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Thursday, December 04, 2003 9:04 PM Instead, a long stress test has to be done, e.g. running 10 millions of continous transactions and queries (simulating real life). No ! No ! No ! No ! real life is what happens outside Oracle databases. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jonathan Lewis INET: [EMAIL PROTECTED] Fat City Network Services-- 858-538-5051 http://www.fatcity.com San Diego, California-- Mailing list and web hosting services - To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
