Remove the global statistics, leaves in 10.2.0.3 partition level.

Hello
There 10.2.0.3 node 4 rac data warehouse, most of the queries are with predicate associated with partition key.
So, there's a lot of cutting partition involved.
Currently, data loading is done via the swap partition and then only that his stats of score is calculated.
We have global stats (global_stats = NO in dba_tables).
Is this right way to treat the 10.2.0.3 statistics?
I know that 10.2.0.4 brings us copy stats solution, but with 10.2.0.3?
How to manage updates statistics, related to shared partition.
As much as I know there is no way to incrementaly update the global statistics, so granuality = > partition seems
the only way.
If I had properly, Oracle calculates global statistics level partition statistics if there is no global stats based on 'true '.
The only issue that I know is related to the estimation of NDV, but I think we can with that life.
Please advice.
Kind regards.
GregG

Really, you need to collect time partition and overall stats. If a query spans more than 1 partition, then global stats are generally used. Stats of the partition are used when there is only a single partition access.

There is no way in 10g for additional aggregate statistics. Which was introduced in 11g. Aggregate statistics are collected by a table scan, they are not aggregated over 10g, 11g only with active differentials.

However, there is a granularity again introduced in 10g called APPROX_GLOBAL AND PARTITION. This is part of the patch 6526370.

I would recommend that collect you global or use the PARTITION AND of APPROX_GLOBAL, but it is better to have a few global statistics.

More details on this here:
http://structureddata.org/2008/07/16/Oracle-11g-incremental-global-statistics-on-partitioned-tables/

--
Kind regards
Greg Rahn
http://structureddata.org

Tags: Database

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