RE: What are the implications of running dbms_stats and analyze compute?
- From: "Mercadante, Thomas F (LABOR)" <Thomas.Mercadante@xxxxxxxxxxxxxxxxx>
- To: <achoto@xxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 9 Aug 2005 11:42:01 -0400
Ana,
Did you run explain plans for the offending sql's? We need to see what
the optimizer chose to help you.
Tom
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Ana Choto
Sent: Tuesday, August 09, 2005 11:24 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: What are the implications of running dbms_stats and analyze
compute?
We have migrated our datawarehouse to 9.2.0.6 from 8.1.7.4. Since the
upgrade we experienced some performance degradation. We run a daily job
to
analyze the datawarehouse schemas using dbms_stats. But, queries that
ran
in seconds were taking hours to run. So, the developers started
reanalyzing the tables with 'analyze compute', which resulted on the
queries running at the same level they were on 8i.
The only thing, is that now, some tables have been analyzed with
dbms_stats
and others with 'analyze compute'. Is there a problem by doing this?
Oracle support asked me to run the dbms_stats job with the 'exec
DBMS_STATS.GATHER_TABLE_STATS(OWNNAME => <'owner'>, TABNAME =>
<'table_name'> , CASCADE => TRUE, method_opt => 'FOR ALL COLUMNS SIZE
200');' command. But this didn't help, so the developers just reanalyze
the tables with 'analyze compute' command.
Thanks
Ana E. Choto
American University
e-Operations - Information Technology
Phone (202) 885-2275
Fax (202) 885-2224
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