Database Tuning (MOSC)

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FIRST_ROWS_100 Optimizer

edited Aug 20, 2009 11:38PM in Database Tuning (MOSC) 5 commentsAnswered
 Hi,

I wonder if anyone has any suggestions to an issue we are having. We have a query which was previously returning data (historical) but suddenly started returning no rows. Doing some analysis, I found that if I add an optimizer hint of ALL_ROWS to the query, it returns the data as expected. The optimizer setting for the database is set to FIRST_ROWS_100. The statistics on the table are available and up to date.

Has anyone else had any experience like this?

Any suggestions would be greatly appreciated.

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