How can I know that in any query any index was used or not?

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The only way to know for sure is to look at the execution plan for that query. You can query V$SQL to find the PLAN_HASH_VALUE for your query. Using this value, you can query V$SQL_PLAN to see the execution plan. If your index is present in the plan for that query, it was used.

This was first published in May 2007

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