Is it possible to find out how frequent an index is used?
Yes sure, you need to create a table called plan_table and use the EXPLAIN PLAN statement. This statement will fill the plan table with information about the index usage of a select statement. Read the manual for EXPLAIN PLAN to see exactly how its done.
User feedback: The question isn't 'Can I tell if an index is used for a particular query' ... the question is 'Can I tell how frequently an index is used'. In Oracle, I do not believe there is any way of knowing if an index is used or how frequently it is used...unless of course you want to analyze every SQL statement which you are aware of. In an ad-hoc environment in particular, you don't know if your indexes are helping.
Eli's response: There is no Oracle built-in solution for telling how frequently an index is used, but you can use the profiling utility to track all server activity and record it in a file or table and check afterwards how many times indexes were used.
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