RE: dbms_xplan + allstats
- From: "Stephens, Chris" <Chris.Stephens@xxxxxxx>
- To: TJ Kiernan <tkiernan@xxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 25 Feb 2011 15:14:44 -0600
Ha! Yeah, I waited. I've started to break the sql down and build it back up
piece by piece to see where this starts.
I feel crazy. Luckily it is Friday and I have a fridge full of good beer
waiting at home.
From: TJ Kiernan [mailto:tkiernan@xxxxxxxxxxx]
Sent: Friday, February 25, 2011 3:11 PM
To: Stephens, Chris; oracle-l@xxxxxxxxxxxxx
Cc: TJ Kiernan
Subject: RE: dbms_xplan + allstats
I have to ask...Did you wait until the query finished? You can't have actual
rows until you have actual results to count.
If there's some bug in DBMS_XPLAN then I suppose the next option I would choose
would be a 10053 trace so you'd know what the CBO is thinking.
Thanks,
T. J.
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From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Stephens, Chris
Sent: Friday, February 25, 2011 2:38 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: dbms_xplan + allstats
11.2.0.2 on RHEL
I'm working on some SQL that suffers from some horrible cardinality estimate
problems due to dummy rows that screw up the columns stats.
Everything was going fine this morning but for some reason I can't get an
execution plan to show me the a-rows now.
I've tried the /*+ gather_plan_stats */ hint.
I've tried "alter session set statistics_level=ALL"
I've tried "alter system set statistics_level=ALL"
I've even tried bouncing the database.
select * from table(dbms_xplan.display_cursor('&sql_id','&child_no','allstats'))
/
....will not show me the a-rows. Anybody have an hints to help me out?
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