RE: Getting multiple explain plans for 1 sql statement
- From: Nirmalya Das <nirmalya@xxxxxxx>
- To: ryan_gaffuri@xxxxxxxxxxx
- Date: Fri, 29 Sep 2006 14:40:36 -0700
I think this has to do with bind variable peeking.
If you are collecting "histograms" as the default "gather_stats_job" does, it
might produce different explain plans for the same query.
Quoting ryan_gaffuri@xxxxxxxxxxx:
why would I spawn child cursors with different execution plans for
the exact same query with bind variables with the same
plan_hash_value?
-------------- Original message --------------
From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
I forgot to mention - there could also be different explain plans for
different child cursors of the same hash_value - check the
"child_number" column, and then check v$sql_shared_cursor to get an
idea of why there are multiple children.
From: Allen, Brandon
Sent: Friday, September 29, 2006 10:54 AM
To: 'ryan_gaffuri@xxxxxxxxxxx'; oracle-l@xxxxxxxxxxxxx
Subject: RE: Getting multiple explain plans for 1 sql statement
It's normal to have multiple rows in v$sql_plan for a given
hash_value - each row represents a single step of the explain plan.
Do both rows have the same plan_hash_value?
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