RE: Does analyze table lock the tables

> Prior to Oracle ver 9 , yes.It is an exclusive lock ...Oracle
> 9 has ONLINE
> option which allows DML while analyzing table...

Mohammed,

Have to differ with you on this - ANALYZE may place a DDL lock, but not a DML lock. This would have otherwise severely restricted concurrency. Should be easy enough to prove: Run two simultaneous sessions, one ANALYZING and one UPDATING a reasonably sized table on a test database.. Look at V$SESSION_EVENT for enqueues, and you will not see any.

It is true that there is an ONLINE sub-clause, but this is applicable _only_ for the VALIDATE STRUCTURE clause, and not for collection of object statistics that was referred by Rick.

John Kanagaraj
Oracle Applications DBA
Hitachi Data Systems
Santa Clara, CA
Phone: 408-970-7002 (W)
Fax: 408 327 3086 (Call/Email prior to fax)

> Reply-To: ORACLE-L_at_fatcity.com
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: Thu, 12 Sep 2002 06:33:29 -0800
>
> Hi DBAs,
>
> I would like to analyze a few tables in production. My
> question does it
> prevent any type of access i.e.,apply locks? If so I can wait
> to do it off
> hours.
>
>
> Thanks
> Rick
>
>
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> Author:
> INET: Rick_Cale_at_teamhealth.com
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: John Kanagaraj
  INET: john.kanagaraj_at_hds.com

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