Re: question on EXPLAIN_PLAN
Hi, Rafiq Thank you for your advise, and thanks everyone, the handsome guys, reply me. You are right, it seems like a High Water Mark problem, after lots of other try, finally I drop that table and re-create that table, copy data, build PK index, analyzed in same way as before, and test the performance, the SQL statement is as fast as we expected. The select count(*) from table_name is still slower than the good guy, but much faster than before. As a problem, it is fixed now. But I still don't understand how can the stupid HWM make such a slow-down on performance? I did lots of tests, I am sure there is nothing to do with analyze,SGA,session_wait,resource. On both two databases, that table and its PK index use one extent on different tablespace on different datafile. Actually, the table in the good performance database has the same HWM as the bad performance buy. I mean, re-create table can fix the problem, but, the problem is not only with the HWM. I will do some further investigation. thanks a lot, Kevin Wang - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Wednesday, February 06, 2002 2:18 PM Try to reduce High Water Mark on your table by creating as select a backup table truncate original table insert into original table from backup table... This is based on your info for full table scan...Please also rebuild indexes on that table and analyze table if you are on COST BASED.. HTH, Regards Rafiq Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: Wed, 06 Feb 2002 13:45:44 -0800 Hi, Bill You are right, there is really something to do with the index. I dropre-created that PK index, it became much faster, but after 5 minutes, it became slow again, and I am sure no records insert/delete/update happened. I dropre-created that indexes again, nothing happened this time, it is still slow! It is really weird! And I found on the bad performance database, a simplest query: select count(*) from table_namewill take 4 seconds! the explain_plan said it used cost-optimizer, using fast_full_index_scan on that PK index, what should I do with the index? I already tried to re-created the PK index. The bad performance database is on a super-box, 4 CPUs and more memory. the good performance one is on a normal box. And the table and index is analyzed at same way. thanks a lot for your reply. Kevin Wang - Original Message - From: Bill Zakrzewski To: kevin wang Sent: Wednesday, February 06, 2002 12:38 PM Subject: Re: question on EXPLAIN_PLAN Kevin, Have these indexes been rebuilt recently? If not, you may want to consider rebuilding the indexes. Not sure if this is your issue, but if you have inserted/deleted records from your tables over time, the index levels may have grown as well. ~ Bill Zakrzewski Senior Consultant Intactus Technology, Inc. - Original Message - From: kevin wang To: LazyDBA.com Discussion Sent: Wednesday, February 06, 2002 2:43 PM Subject: question on EXPLAIN_PLAN Hi, guys The problem belows is really make me confused and gave me big trouble, is there someone can give me some hlep? I have two databses, same version(oracle 8.1.6),same O/S(win2000), same schema structure, different data(but small difference of size). and even exactly same explain_plan of my sql query. But on one database, the cardinality of one PK index access upon one table is 27(cost=2,card=27,bytes=756) (table rows 263758) and the other is 11706 (cost=3,card=11706,bytes=199002)( table rows 351173). so, on one DB the sql query took 300ms, one the other, it took 5 seconds! Any advise is highly appreciated. thanks, Kevin Wang Database Administrator Vivonet Canada Inc. MOHAMMAD RAFIQ _ Chat with friends online, try MSN Messenger: http://messenger.msn.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mohammad Rafiq INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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.com -- Author: kevin wang INET: [EMAIL PROTECTED] Fat City Network
question on EXPLAIN_PLAN
Hi, guys The problem belows is really make me confused and gave me big trouble, is there someone can give me some hlep? I have two databses, same version(oracle 8.1.6),same O/S(win2000), sameschema structure, different data(but small difference ofsize). and even exactly same explain_plan of my sql query. But on one database, the cardinality of one PK index access upon one table is 27(cost=2,card=27,bytes=756) (table rows 263758) and the other is 11706 (cost=3,card=11706,bytes=199002)( table rows 351173). so, on one DB the sql query took 300ms, one the other, it took 5 seconds! Any advise is highly appreciated. thanks, KevinWangDatabase Administrator Vivonet Canada Inc.
Re: question on EXPLAIN_PLAN
Hi, Bill You are right, there is really something to do with the index. I dropre-created that PK index, it became much faster, but after 5 minutes, it became slow again, and I am sure no records insert/delete/update happened. I dropre-created that indexes again, nothing happened this time, it is still slow! It is really weird! And I found on the bad performance database, a simplest query: select count(*) from table_name will take 4 seconds! the explain_plan said it used cost-optimizer, using fast_full_index_scan on that PK index, what should I do with the index? I already tried to re-created the PK index. The bad performance database is on a super-box, 4 CPUs and more memory. thegood performance one is on a normal box. And thetable and index is analyzed at same way. thanks a lot for your reply. KevinWang - Original Message - From: Bill Zakrzewski To: kevin wang Sent: Wednesday, February 06, 2002 12:38 PM Subject: Re: question on EXPLAIN_PLAN Kevin, Have these indexes been rebuilt recently? If not, you may want to consider rebuilding the indexes. Not sure if this is your issue, but if you have inserted/deleted records from your tables over time, the index levels may have grown as well. ~Bill ZakrzewskiSenior ConsultantIntactus Technology, Inc. - Original Message - From: kevin wang To: LazyDBA.com Discussion Sent: Wednesday, February 06, 2002 2:43 PM Subject: question on EXPLAIN_PLAN Hi, guys The problem belows is really make me confused and gave me big trouble, is there someone can give me some hlep? I have two databses, same version(oracle 8.1.6),same O/S(win2000), sameschema structure, different data(but small difference ofsize). and even exactly same explain_plan of my sql query. But on one database, the cardinality of one PK index access upon one table is 27(cost=2,card=27,bytes=756) (table rows 263758) and the other is 11706 (cost=3,card=11706,bytes=199002)( table rows 351173). so, on one DB the sql query took 300ms, one the other, it took 5 seconds! Any advise is highly appreciated. thanks, KevinWangDatabase Administrator Vivonet Canada Inc.
Re: question on EXPLAIN_PLAN
Yes, Mike, I analyzed the table and PK index on the two databases at the same way, it seems that there is something wrong with the PK index, the select count(*) from table_name query took 4 seconds, and only 335199 rows atcually. it use fast_full_index scan of the PK index, and I re-created the PK index, same thing. that's very bad. it is Oracle 8.1.6 on win2000. thanks for reply. Kevin Wang - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Wednesday, February 06, 2002 1:55 PM Kevin, Have you analyzed the tables on both databases? Card is the CBO's estimate of the number of rows it will process. Mike From: kevin wang [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Subject: question on EXPLAIN_PLAN Date: Wed, 06 Feb 2002 11:43:38 -0800 Hi, guys The problem belows is really make me confused and gave me big trouble, is there someone can give me some hlep? I have two databses, same version(oracle 8.1.6),same O/S(win2000), same schema structure, different data(but small difference of size). and even exactly same explain_plan of my sql query. But on one database, the cardinality of one PK index access upon one table is 27(cost=2,card=27,bytes=756) (table rows 263758) and the other is 11706 (cost=3,card=11706,bytes=199002)( table rows 351173). so, on one DB the sql query took 300ms, one the other, it took 5 seconds! Any advise is highly appreciated. thanks, Kevin Wang Database Administrator Vivonet Canada Inc. _ Chat with friends online, try MSN Messenger: http://messenger.msn.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mike Killough INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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.com -- Author: kevin wang INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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).
limit user CPU usage
Hi, Guys, Is there some parameters or user-profile prometers in Oracle can limit user CPU usage? I mean, make specific user or all users use less CPU, I has a SQL query that use 100% CPU. I know the SQL is bad, but beforedeveloper change it, Is there something I can do? Any suggestion will be highly appreciated. My environment is Oracle8.1.6 on Win2000. Thanks, Kevin Wang
Re: limit user CPU usage
Thanks, Ron, I will try it. Kevin Wang - Original Message - To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Sent: Tuesday, January 15, 2002 11:55 AM Kevin, You could try creating a profile with the cpu_per_call and cpu_per_session set ta a particular value. It will limit the amount of time in hundredths of a second to the user assigned to the profile. I woul experiment with the values before I assigned it to a user. The manual does not say it will act as a choke on cpu usage other than time. ROR mª¿ªm [EMAIL PROTECTED] 01/15/02 01:10PM Hi, Guys, Is there some parameters or user-profile prometers in Oracle can limit user CPU usage? I mean, make specific user or all users use less CPU, I has a SQL query that use 100% CPU. I know the SQL is bad, but before developer change it, Is there something I can do? Any suggestion will be highly appreciated. My environment is Oracle8.1.6 on Win2000. Thanks, Kevin Wang -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Ron Rogers INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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.com -- Author: kevin wang INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists 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: How to backup MTS database with RMAN
Title: How to backup MTS database with RMAN Hi, Hulmet, I tried. To use RMAN on MTS database environment, both database server machine and the RMAN machine(the machine you run RMAN on it) should use dedicated server mode instead of shared mode. It means the tnsnames.ora file on these two machines(or one machine) should contain SERVER=DEDICATED line. Maybe only application box can use shared-mode(server=shared). example: SHAGGY = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.25)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = SHAGGY) (server = dedicated) ) ) Kevin Wang - Original Message - From: Daiminger, Helmut To: Multiple recipients of list ORACLE-L Sent: Wednesday, December 19, 2001 5:25 AM Subject: How to backup MTS database with RMAN Hi! Since I'm pretty new to RMAN I have a rather basic question: is it possible to backup databases running in multithreaded server mode with RMAN? Or does this have to be dedicated server mode? $ rman target sys/@kpmgi rcvcat rman/x@admserv Recovery Manager: Release 8.1.7.2.0 - Production RMAN-06005: connected to target database: KPMGI (DBID=3995384462) RMAN-06008: connected to recovery catalog database RMAN register database; RMAN-03022: compiling command: register RMAN-03023: executing command: register RMAN-08006: database registered in recovery catalog RMAN-03023: executing command: full resync RMAN-03026: error recovery releasing channel resources RMAN-00571: === RMAN-00569: === ERROR MESSAGE STACK FOLLOWS === RMAN-00571: === RMAN-07005: error during channel cleanup RMAN-07004: unhandled exception during command execution on channel default RMAN-10035: exception raised in RPC: ORA-19550: cannot use backup/restore functions while using dispatcher RMAN-10031: ORA-19550 occurred during call to DBMS_BACKUP_RESTORE.CFILEUSECURRENT RMAN-03008: error while performing automatic resync of recovery catalog RMAN-07004: unhandled exception during command execution on channel default RMAN-10035: exception raised in RPC: ORA-19550: cannot use backup/restore functions while using dispatcher RMAN-10031: ORA-19550 occurred during call to DBMS_BACKUP_RESTORE.CFILEMAKEANDUSESNAPSHOT Do I just have to take out mts_dispatchers = "(protocol=TCP)" from the init.ora file? This is 8.1.7.2.0 on Sun Solaris. Thanks, Helmut
Re: How to backup MTS database with RMAN
Title: How to backup MTS database with RMAN Hi, Hulmet, I tried. To use RMAN on MTS database environment, both database server machine and the RMAN machine(the machine you run RMAN on it) should use dedicated server mode instead of shared mode. It means the tnsnames.ora file on these two machines(or one machine) should contain SERVER=DEDICATED line. Maybe only application box can use shared-mode(server=shared). example: SHAGGY = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.25)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = SHAGGY) (server = dedicated) ) ) Kevin Wang - Original Message - From: Daiminger, Helmut To: Multiple recipients of list ORACLE-L Sent: Wednesday, December 19, 2001 5:25 AM Subject: How to backup MTS database with RMAN Hi! Since I'm pretty new to RMAN I have a rather basic question: is it possible to backup databases running in multithreaded server mode with RMAN? Or does this have to be dedicated server mode? $ rman target sys/@kpmgi rcvcat rman/x@admserv Recovery Manager: Release 8.1.7.2.0 - Production RMAN-06005: connected to target database: KPMGI (DBID=3995384462) RMAN-06008: connected to recovery catalog database RMAN register database; RMAN-03022: compiling command: register RMAN-03023: executing command: register RMAN-08006: database registered in recovery catalog RMAN-03023: executing command: full resync RMAN-03026: error recovery releasing channel resources RMAN-00571: === RMAN-00569: === ERROR MESSAGE STACK FOLLOWS === RMAN-00571: === RMAN-07005: error during channel cleanup RMAN-07004: unhandled exception during command execution on channel default RMAN-10035: exception raised in RPC: ORA-19550: cannot use backup/restore functions while using dispatcher RMAN-10031: ORA-19550 occurred during call to DBMS_BACKUP_RESTORE.CFILEUSECURRENT RMAN-03008: error while performing automatic resync of recovery catalog RMAN-07004: unhandled exception during command execution on channel default RMAN-10035: exception raised in RPC: ORA-19550: cannot use backup/restore functions while using dispatcher RMAN-10031: ORA-19550 occurred during call to DBMS_BACKUP_RESTORE.CFILEMAKEANDUSESNAPSHOT Do I just have to take out mts_dispatchers = "(protocol=TCP)" from the init.ora file? This is 8.1.7.2.0 on Sun Solaris. Thanks, Helmut
