/* Unused and almost unused indexes */ /* Ordered by their size relative to the number of index scans. Exclude indexes of very small tables (less than 5 pages), where the planner will almost invariably select a sequential scan, but may not in the future as the table grows */

SELECT

schemaname || '.' || relname AS table,
indexrelname AS index,
pg_size_pretty(pg_relation_size(i.indexrelid)) AS index_size,
idx_scan as index_scans

FROM pg_stat_user_indexes ui JOIN pg_index i ON ui.indexrelid = i.indexrelid WHERE NOT indisunique AND idx_scan < %{min_scans} AND pg_relation_size(relid) > 5 * 8192 ORDER BY pg_relation_size(i.indexrelid) / nullif(idx_scan, 0) DESC NULLS FIRST, pg_relation_size(i.indexrelid) DESC;