Delete global stats, leave partition level only in 10.2.0.3 .

Hi,
there is 10.2.0.3 4 node rac datawarehouse , most queries are with predicate related to partition key .
So there is a lot of partition prunning involved .
Currently data load is done via exchange partition and then only that partition stats is calculated.
We dont got global stats (global_stats = NO in dba_tables) .
Is that right way to deal with statistics in 10.2.0.3 ?
I know that 10.2.0.4 brings us copy stats solution, but what with 10.2.0.3 ?
How to deal with statistics update , related to exchanged partition .
As far as I know there is no way to incrementaly update global statistics, so granuality => partition seems
the only way .
If I got that correctly, Oracle calculates global statistics from partition level statistics if there is no 'true' global stats calculated .
The only issue I know is related to NDV estimation, but I think we can life with that.
Please advice .
Regards.
GregG

You really should collect both partition and global stats. If a query spans more than 1 partition then global stats are generally used. Partition stats are used when there is only a single partition access.
There is no way in 10g to get incremental global stats. That was introduced in 11g. Global stats are collected by a table scan, they are not aggregated on 10g, only 11g with incremental enabled.
However, there was a new granularity introduced in 10g called APPROX_GLOBAL AND PARTITION. This is part of patch 6526370.
I'd recommend that you either gather global or use the APPROX_GLOBAL AND PARTITION, but it is best to have some global stats.
More details on this here:
http://structureddata.org/2008/07/16/oracle-11g-incremental-global-statistics-on-partitioned-tables/
Regards,
Greg Rahn
http://structureddata.org

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