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Impact of new composite index on existing SQL using this table

edited Jan 25, 2019 2:28PM in SQL Performance (MOSC) 8 commentsAnswered

Hi,

Impact of new composite index on existing SQL using this table. Enterprise 12.1.0.2.0 customer licensed for diagnostic and tuning pack.

Because of poor performing SQL application becomes unusable at very heavy load times. ADDM report has identified the SQL needing tuned, and there are others as well Advisor suggests adding new composite index but we have a friendly difference of opinion among colleagues as how to proceed. Some are concerned about impact of slowing down speed of inserts as well.

The specific question is how can I determine the impact of adding the new index to other SQL statements using this table? I am struggling to find any documents on this subject. Is the only option to build new index on DEV and test the application and hope to execute all SQL on this table. It is a legacy system and is complex.

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