Re: Multiple SQL version count with cusror_sharing=similar

From: Randolf Geist <>
Date: Wed, 01 Jul 2009 15:42:15 +0200
Message-Id: <>

> I just checked that after parsing first version of the query, sql
> trace of second version (i.e. where deptno=20) is resulting in
> library cache miss. Need to re-run the case, and if result is
> consistent, will definitely share.


just beware of the effect of enabling SQL trace: By enabling SQL Trace you force a library cache miss if the version of the statement *with tracing enabled* is not yet in the library cache, because this setting is part of environment that is checked when looking for existing child cursors. You might want to double-check V$SQL_SHARED_CURSOR to make sure that the miss wasn't caused by simply enabling the trace.

Depending on the order of execution you need to take that into account for your analysis.


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Received on Wed Jul 01 2009 - 08:42:15 CDT

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