RE: inconsistent query performance

How complex is the query? Can you send out the sql and/or the explain plan? Are there just tables in the from(s) or are there also views. Also are there any function calls? Are you seeing different performance on the same exact query or are you changing any of the literals?  

Ken  

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Stauffer, Bob
Sent: Wednesday, January 18, 2017 1:28 PM To: 'oracle-l_at_freelists.org' <oracle-l_at_freelists.org> Subject: inconsistent query performance  

Hi all,  

Oracle RDBMS EE 11.2.0.4.0 - 64bit

Red Hat Enterprise Linux 5.11  

Any suggestions on how I can troubleshoot a query that performs inconsistently? Sometimes it takes a minute to run and sometimes it takes over an hour. It generally uses one of two explain plans - one fast and one slow. Although it sometimes uses a different plan. I've checked the stats and they are up to date. I generally run it in TOAD, but the same problem occurs in SQLPlus, SQL Developer, and other interfaces. It doesn't matter whether the system is busy or quiet. And it happens within the same session - I can run it one right after another and it will change the plan for each execution.  

Any help would be appreciated. I'm a little rusty with Oracle.  

Thanks much.  

Bob Stauffer

DBA/Database Developer  

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