Query to Check Unused Index

  /*Query to Check Unused Index */

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SELECT now(), schemaname || ‘.’ || relname AS table, indexrelname AS index, pg_size_pretty(pg_relation_size(i.indexrelid)) AS index_size, idx_scan as index_scans,pg_get_indexdef(i.indexrelid) FROM pg_stat_user_indexes ui JOIN pg_index i ON ui.indexrelid = i.indexrelid WHERE NOT indisunique AND idx_scan < 50 AND pg_relation_size(relid) > 5 * 8192 ORDER BY pg_relation_size(i.indexrelid) DESC LIMIT 20 ;