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тАО08-30-2005 03:22 AM
тАО08-30-2005 03:22 AM
Re: 9i Oracle Performance issues bad Cache Hits
The application group stated that they are not using CBO, but rather rules.
The DBA's stated the all the tables in the DB have NOT been reorged in 2 years!
Starting to sound more like a DB issue...
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тАО08-30-2005 03:29 AM
тАО08-30-2005 03:29 AM
Re: 9i Oracle Performance issues bad Cache Hits
I would like to hear the answers as for the server features to have a clearer idea of what may be happening. That is, SGA size, RAM, OS version (IA-64, PA-RISC), Oracle version (9.2.0.6?).
Also, be advised that Oracle9i processes consume much more memory then in earlier releases. I have seen on IA-64 user processes taking between 12M-20M, and even some background processes 90M. So, this could really be the cause of poor performance based on what you said about your wcache. I'd suggest monitoring the available RAM at peak hour.
Regards,
ARC
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тАО08-30-2005 10:16 AM
тАО08-30-2005 10:16 AM
Re: 9i Oracle Performance issues bad Cache Hits
We debugged it by doing things like removing statistic; removing indexes; and recreating indexes (all can usually be done on the fly).
The effect of a full table scan (as opposed to an index scan) on very large tables (with a 120Gb databse - I bet you've got a few) can be absolutely disasterous (in terms of performance)
Identify the full table scans, and get rid of the old index, and make the system use another one. That's my tip.
Good luck!
Leon
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тАО08-31-2005 02:23 AM
тАО08-31-2005 02:23 AM
Re: 9i Oracle Performance issues bad Cache Hits
I want to thank everyone for the responses so far. I've forwarded them all to the DBA's and I think they are starting to take some ownership of the problem. I'll keep everyone updated and dole out the points soon.
JC
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тАО08-31-2005 04:04 AM
тАО08-31-2005 04:04 AM
Re: 9i Oracle Performance issues bad Cache Hits
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тАО08-31-2005 04:38 AM
тАО08-31-2005 04:38 AM
Re: 9i Oracle Performance issues bad Cache Hits
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тАО08-31-2005 05:16 AM
тАО08-31-2005 05:16 AM
Re: 9i Oracle Performance issues bad Cache Hits
I would recommend the following mount options for your filesystems as well.
logfiles:
log,nodatainlog,mincache=direct,convosync=direct
datafiles:
delaylog,nodatainlog,mincache=direct,convosync=direct
If you just have mixed filesystems (with log and datafiles together), just use the one for datafiles. This should bypass the buffer cache for the UX side, which might help.
Brian
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тАО08-31-2005 05:26 AM
тАО08-31-2005 05:26 AM
Re: 9i Oracle Performance issues bad Cache Hits
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тАО08-31-2005 06:27 AM
тАО08-31-2005 06:27 AM
Re: 9i Oracle Performance issues bad Cache Hits
SQL> select value from v$parameter where name = 'optimizer_mode';
or
SQL> show parameter optimizer_mode
A value of CHOOSE means you are running the CBO. If you are using RBO it will be RULE.
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тАО08-31-2005 06:57 AM
тАО08-31-2005 06:57 AM