RE: Global Stats

were you wrong?

I dunno, you're doing all the research. ;)

It was just a suggestion. :)

Jared

"Koivu, Lisa" <Lisa.Koivu_at_efairfield.com> Sent by: root_at_fatcity.com
 01/29/2003 07:09 AM
 Please respond to ORACLE-L  

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        RE: Global Stats

Hi Jared,
Actually I think monitoring won't work in my case. Data loads fire throughout the day and the docs say that in 8i, analyze can fire based upon table monitoring sometime within 3 hours after data changes. I would rather include a manual fire of analyze in my data load and avoid any locking issues or contention for resources. In addition, if temp space is blown during "auto-analyze" (fired based upon monitoring), would I know about it? Just my thoughts. Am I wrong?
Lisa
-----Original Message-----
Sent: Wednesday, January 29, 2003 3:55 AM To: Multiple recipients of list ORACLE-L

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

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