Find Duplicate Indexes in PostgreSQL
Lists indexes defined identically on the same table, columns and predicate. Reduces unnecessary write cost and disk usage.
SELECT indrelid::regclass AS table_name,
array_agg(indexrelid::regclass) AS duplicate_indexes,
pg_size_pretty(sum(pg_relation_size(indexrelid))) AS total_size
FROM pg_index
GROUP BY indrelid, indkey, indclass, indoption, indexprs::text, indpred::text
HAVING count(*) > 1;Remove redundant duplicates using `DROP INDEX CONCURRENTLY`; be cautious with indexes backing foreign key or uniqueness constraints.
- This script is designed for read-only diagnostics; it does not alter schema or modify data directly.
- Prior to executing on production systems under high load, verify the target database version (Min. Version: 9.x).
- Exercise caution with mutating actions (e.g., terminating sessions or dropping indexes) referenced in the notes section.
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Uses pg_blocking_pids to pair blocked and blocking sessions with their queries and wait times. Shows the root cause of a lock chain in seconds.
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Lists never-scanned indexes that are neither unique nor primary keys, with their sizes. Surfaces cleanup candidates to cut write overhead and disk usage.