RE: _gby_hash_aggregation_enabled=false
- From: "Taylor, Chris David" <Chris.Taylor@xxxxxxxxxxxxxxx>
- To: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 30 Nov 2007 09:51:57 -0600
According to the explain plan, the queries went back to 'SORT (GROUP
BY)' immediately. But I didn't run an extended trace to verify the
execution was actually doing that.
select count(distinct plan_hash_value) from v$sql_plan where operation =
'HASH' and options = 'GROUP BY';
-----------
0 Rows
Chris Taylor
Sr. Oracle DBA
Ingram Barge Company
Nashville, TN 37205
Office: 615-517-3355
Cell: 615-354-4799
Email: chris.taylor@xxxxxxxxxxxxxxx
________________________________
From: Allen, Brandon [mailto:Brandon.Allen@xxxxxxxxxxx]
Sent: Friday, November 30, 2007 9:49 AM
To: Taylor, Chris David; oracle-l@xxxxxxxxxxxxx
Subject: RE: _gby_hash_aggregation_enabled=false
When you set it, did it stop the query from using HASH GROUP BY?
If you don't mind, could you please check and see what you get from the
following query:
select count(distinct plan_hash_value) from v$sql_plan where operation =
'HASH' and options = 'GROUP BY';
Thanks,
Brandon
________________________________
From: Taylor, Chris David [mailto:Chris.Taylor@xxxxxxxxxxxxxxx]
Well I was going to say we had set it and have not experienced any
problems.
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