Generating statistics has negative impact on performance

Hello,
We have a strange situation with our COPA CE4XXXX table. When database statistics are generated (DB20) for this table, we immediately notice a very significant performance drop when selecting from this table. In orer to correct this, if we adjust/rebuild the index of the table using the database utility tool, it seems to resolve the issue. Either way, the indexes that Oracle chooses for the query we are monitoring does not change, but performance is decreased after new statistics are generated.
The Oracle version is 9.2.0.8.0, and the statistics were generated with method 'E' sample 'P25'.
Any clues?

Hello Daniel,
i am not quite sure about Oracle 9i, DB20 and the index rebuild.
Please check the options which are given to the REBUILD index command by SAP.
http://download.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_18a.htm#SQLRF00805
> COMPUTE STATISTICS Clause
> Specify COMPUTE STATISTICS if you want to collect statistics at relatively little cost during the rebuilding of an index.
>
> If you create an index using another index (instead of a table), the original index might not provide adequate statistical information. Therefore, Oracle generally uses the base table to compute the statistics, which will improve the statistics but may negatively affect performance.
I am only sure about Oracle 10g (because there is always a compute).. maybe your gathered statistics with method 'E' sample 'P25' are not good enough.. or this is maybe a bug.
But without the execution plans, statistic data and the exact commands that are generated in the background.. it is really hard to say.
Regards
Stefan

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