Oracle-L: RE: ANALYZE question

From: Vikas Khanna <vkhanna_at_quark.co.in>
Date: Wed, 24 Jul 2002 02:08:22 -0800
Message-ID: <F001.004A08A5.20020724020822@fatcity.com>

No Impact. Analyze would just collect the latest statistics for the concerned table and the next time any query gets fired on this table the optimizer (CBO) would generate the execution plan based on these statistics.

I also believe that this would be healthier sign as the CBO is generating plans as per the latest what is available and not on the stale ones.

Moreover, it would be good that instead of Using Analyze you should use DBMS_STATS.gether_table_statistics stored procedure as it :

DBMS_STATS can run in parallel mode and hence would be faster than Analyze (which is a serial operation)
Only if the statistics are stale the DBMS_STATS would execute.
You can always Export/Import/Set the statistics from one db to another db.

Thanks,
Vikas Khanna

-----Original Message-----
Sent: Wednesday, July 24, 2002 2:33 PM
To: Multiple recipients of list ORACLE-L

Apart from explicity running an ANALYZE command against a table, what, if any, other events/actions can cause an analyze to be run on the table?

Seán O' Neill
Organon (Ireland) Ltd.
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Author: O'Neill, Sean
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Author: Vikas Khanna
INET: vkhanna_at_quark.co.in

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