Database Tuning (MOSC)

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Cost Based statistics performance difference

edited Jan 28, 2009 11:42PM in Database Tuning (MOSC) 5 commentsAnswered

Db Version : 9204

OS : AIX5.3

Our database optimizer mode set to "CHOOSE". We are gathering statistics for some tables and this helped to improve the performance of some process which uses these tables. But we had big impact on some reports queries which build based on these tables. All the reports queries excution plan has changed and all tables went for FULL table scan with the statistics. We are doing some workaround to avoid this problem. Whenever we want to refresh the reports, we are deleting the statistics and taking reports. But we would like to avoid this workaround.

Can anyone suggest some solutions for this problem.

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