On the other hand, you might have overallocated the space, which would leave plenty of blocks on the free list, thus minimizing the impact. These things are best seen on "almost full" tables with things like row chaining, row migration, waits on ITL entries and other lovely things. Looks like you've benn lucky so far. As I've told you before, having tablespaces created with "SEGMENT SPACE MANAGEMENT AUTO" option takes care of that. if your tablespace is created with a command like
"CREATE TABLESPACE DATA01 DATAFILE '/data01/SID1/data01.dbf' size 8192M reuse AUTOEXTEND ON NEXT 4096M MAXSIZE 32769M EXTENT MANAGEMENT LOCAL AUTOALLOCATE SEGMENT SPACE MANAGEMENT AUTO" then you can create tables without any additional parameters and everything will be kosher. The tablespace above requires something called "large files support" from the file system and cannot be used on FAT file systems or ISO9660-RR/Joliet file system. Practically anyhing else (UFS,VxFS,ReiserFS,Ext(2|3),XFS,JFS,OCFS,NTFS (scheduled to go away when the new virus propagataion engine enters production)). BTW, what OS and database version do you use? On 11/07/2003 01:24:25 PM, Maryann Atkinson wrote: > > >The answer is that > >free list handling is overhead, which means that the database is working on > >its own structures and not working on the user data. It's easy to conceive a > >busy transaction table to which records are frequently added and from which > >they're frequently removed. Having only one parameter would significantly > >increase the amount of time spent in moving blocks to and from the free > >list, > >and significantly increase the overhead. You can test it by setting up a > >table > >with PCTFREE+PCTUSED=100. In other word, the answer to your question is that > >two parameters are needed to reduce the overhead of the free list maintenance. > > By the way, I just wanted to let you know I tried that PCTFREE+PCTUSED=100 > I used PCTFREE 40 and PCTUSED 60 on a specific table space, and created > a table there which I updated/deleted records quite a bit, but I didnt see > much > of a difference. It might have been because there werent many people > on the system at the time. > > thx > maa > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Maryann Atkinson > 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 Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Wang Trading LLC and any of its subsidiaries each reserve the right to monitor all e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorized to state them to be the views of any such entity. -- 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).
