Re: Global Stats

You may want to read up on table monitoring.

Jared

On Tuesday 28 January 2003 11:10, Koivu, Lisa wrote:
> Hi everyone,
>
> Back to the lovely world of Oracle :) I've been reading up on statistics.
> Out of the 8.1.7 doco:
> /*
> Partitioned schema objects may contain multiple sets of statistics. They
> can have statistics which refer to the entire schema object as a whole
> (global statistics), they can have statistics which refer to an individual
> partition, and they can have statistics which refer to an individual
> subpartition of a composite partitioned object.
>
> Unless the query predicate narrows the query to a single partition, the
> optimizer uses the global statistics. Because most queries are not likely
> to be this restrictive, it is most important to have accurate global
> statistics. Intuitively, it may seem that generating global statistics from
> partition-level statistics should be straightforward; however, this is only
> true for some of the statistics. For example, it is very difficult to
> figure out the number of distinct values for a column from the number of
> distinct values found in each partition because of the possible overlap in
> values. Therefore, actually gathering global statistics with the DBMS_STATS
> package is highly recommended, rather than calculating them with the
> ANALYZE statement
>
> */
> The table I need to generate stats for is currently 32GB and grows by ~2GB
> per week. Even the smallest estimate with calculating global stats will
> take a long long time and I may not be able to spring for all the required
> temp space.
>
> How does the list feel about global stats? Does anyone agree with the
> documentation that they "most important"? I'm thinking my partitioned
> statistics are the "most important".
>
> Any input is appreciated. Thanks
>
> Lisa Koivu
> Oracle Database Administrator
> Fairfield Resorts, Inc.
> 5259 Coconut Creek Parkway
> Ft. Lauderdale, FL, USA 33063

Content-Type: text/html; charset="iso-8859-1"; name="Attachment: 1"
Content-Transfer-Encoding: quoted-printable
Content-Description: 
----------------------------------------

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Jared Still
  INET: jkstill_at_cybcon.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).