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RE: fire off multiple dbms_stats.gather_schema

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Thu, 8 Jul 2004 10:56:54 -0500
Message-ID: <0186754BC82DD511B5C600B0D0AAC4D607B0098A@EXCHMN3>


David

   Oops, I read your posting more closely and it looks as if you are only gathering statistics on tables that don't have any. Am I reading that correctly. Also, you might want to consider the SAMPLE SIZE AUTO. With a fixed percentage you may be undersampling small tables and oversampling large ones.

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
I said it "looked" clear - Riddick

-----Original Message-----

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of DENNIS WILLIAMS Sent: Thursday, July 08, 2004 .10:50 AM
To: 'oracle-l_at_freelists.org'
Subject: RE: fire off multiple dbms_stats.gather_schema

David

   Dumb question. I always understood that: "Whenever possible, dbms_stats routines will run via parallel query". Is there a reason this doesn't work for you?

   Another idea. Instead of making dbms_stats run faster, consider whether you are spending too many resources analyzing. dbms_stats can use the GATHER STALE option. I think Wolfgang Breitling has stated that once his queries are operating satisfactorily he doesn't gather statistics any more.

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
I said it "looked" clear - Riddick

-----Original Message-----

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of David Sent: Wednesday, July 07, 2004 5:42 PM
To: oracle-l_at_freelists.org
Subject: fire off multiple dbms_stats.gather_schema

I am using dynamic sql to generate code that will analyze schemas. I would just gather_database stats, but the request is that I use dbms_stats.gather_Schema so that the process can be broken down into concurrent sets and run concurrently(and with parallel). Does anyone have any advice, ideas or tips on how I might accomplish this?

Here is what I'm currently using:
select
'exec dbms_stats.gather_schema_stats(ownname=> ' ||chr(39)|| owner||chr(39)||' ,estimate_percent=> 10 ,cascade=> TRUE , block_sample=> TRUE ,degree=> 4);'
 FROM DBA_TABLES
  WHERE OWNER NOT IN ('SYS')
  AND PARTITIONED = 'NO'
  AND LAST_ANALYZED < SYSDATE - 14
UNION
select
'exec dbms_stats.gather_schema_stats(ownname=> ' ||chr(39)|| owner||chr(39)||' , estimate_percent=> 10 ,cascade=> TRUE , block_sample=> TRUE ,degree=> 4);'
 FROM DBA_TABLES
  WHERE OWNER NOT IN ('SYS')
  AND LAST_ANALYZED IS NULL; Yes, I do know that the options clause will take care of some of the functionality that I am filtering via the predicate and I have plans to incorporate that feature.
Thanks!
--

..
David



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Received on Thu Jul 08 2004 - 10:58:08 CDT

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