High SQL version count and low executions from ADDM Report!!

Hi, all.
I am reading an ADDM Report.
I found something strange.
In the "SQL ordered by Version Count" section,
an applicaion sql statement has the value of 45 Version count
but has the value of 1 Executions. The time interval is one hour.
The database has only one applicaion user,
and thus all sessions connect to the same user.
What does "45 version count" mean??
The application is using bind variables.
How can I reduce this number??
I am hitting "library cache lock" wait event from time to time.
Thanks and Regards.
Message was edited by:
user507290
Message was edited by:
user507290
Message was edited by:
user507290

You could get a high version count if the bind variables are character type and allow large variations in length, see:
http://jonathanlewis.wordpress.com/2007/01/05/bind-variables/
The oddity of lots of versions with only one execution could be an unlucky timing thing relating to cursor invalidation - the child cursors can be left trailing with zero'ed statistics rather than being cleared out when they should be.
Problems with library cache lock can be a consequence of large numbers of versions - simply because many people want, and may have to create, different child cursors for the same statement at the same time. (However, you've already received some comments about RAC and gathering stats which can be an underlying cause of that issue).
Looking at it from a different angle, are there any global temporary tables involved, and if so are they 'on commit preserve rows', and Is this 10.1 or 10.2 ?
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk

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