How to find unused indexes in an Oracle schema?
First enable index monitoring, wait for a period of time and then query the V$OBJECT_USAGE view. If USED is 'NO', it may not be used. Then combine AWR and SQL execution plan data to further confirm, and finally delete it carefully.
To find unused indexes in an Oracle schema, you need to analyze index usage statistics over a representative period. Oracle does not automatically track index usage unless you enable monitoring, and even then, it only shows whether an index has been used since monitoring was turned on.
Enable Index Monitoring
Before you can detect unused indexes, you must enable monitoring for each index or all indexes in the schema.
- To monitor a single index: ALTER INDEX schema.index_name MONITORING USAGE;
- To monitor all indexes in a schema, run a script to generate ALTER INDEX commands for each index.
- After enabling, wait for a realistic workload cycle (eg, one week) to gather meaningful data.
Check V$OBJECT_USAGE View
Once monitoring is enabled and sufficient time has passed, query V$OBJECT_USAGE to see usage status.
- Run this query to list monitored indexes and their usage:
SELECT index_name, table_name, monitoring, used, start_monitoring, end_monitoring
FROM v$object_usage
WHERE owner = 'YOUR_SCHEMA_NAME';
- If USED = 'NO' , the index hasn't been used since monitoring started.
- Consider dropping such indexes after confirming they are truly unnecessary.
Analyze Automatic Workload Repository (AWR) and DBA_HIST_SQLSTAT
For historical insight beyond current monitoring, check AWR data to see if indexes were used in execution plans.
- Query DBA_HIST_SQLSTAT joined with DBA_IND_COLUMNS to find if an index appears in past SQL execution plans.
- This method requires diagnostic pack licensing.
Use Real-Time SQL Monitoring and Execution Plans
Check if indexes appear in recent execution plans using:
- DBA_HIST_SQL_PLAN – Historical plan data from AWR.
- V$SQL_PLAN – Current shared pool plans.
- Look for your index names in the OBJECT_NAME column where OPERATION = 'INDEX'.
Indexes not appearing in any plans over time, especially when queries could benefit from them, may be unused or redundant.
Basically, turn on monitoring, wait, then check V$OBJECT_USAGE. Supplement with AWR and SQL plan data for deeper analysis. Always validate before dropping any index.
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