Table and index sizes postgres
Top tables by total size including indexes and TOAST
SELECT relname, pg_size_pretty(pg_total_relation_size(oid)) AS total, pg_size_pretty(pg_relation_size(oid)) AS table FROM pg_class WHERE relkind='r' ORDER BY pg_total_relation_size(oid) DESC LIMIT 20;
more postgres
all 29 commands →
Find unused indexes
SELECT relname, indexrelname, idx_scan, pg_size_pretty(pg_relation_size(indexrelid)) AS size FROM pg_stat_user_indexes WHERE idx_scan=0 ORDER BY pg_relation_size(indexrelid) DESC;
Check autovacuum status
SELECT relname, n_dead_tup, last_autovacuum, last_autoanalyze FROM pg_stat_user_tables ORDER BY n_dead_tup DESC LIMIT 20;
Reindex without locking
REINDEX INDEX CONCURRENTLY <name>; -- note: cannot run inside a transaction block
Create index online
CREATE INDEX CONCURRENTLY idx_<name> ON <table>(col); -- monitor: SELECT * FROM pg_stat_progress_create_index;
Parallel dump and restore
pg_dump -Fc -j 4 -d <name> -f db.dump && pg_restore -j 4 -d <name> db.dump