Show table sizes

Top 20 tables by total size including indexes and TOAST

psql -U myuser -d mydb -c "SELECT schemaname, tablename, pg_size_pretty(pg_total_relation_size(schemaname||'.'||tablename)) size FROM pg_tables ORDER BY pg_total_relation_size(schemaname||'.'||tablename) DESC LIMIT 20;"
tool
postgres29 commands
tags
postgresmonitoring

More postgres commands

  • Show index usage
    psql -U myuser -d mydb -c "SELECT relname, indexrelname, idx_scan, idx_tup_read FROM pg_stat_user_indexes ORDER BY idx_scan DESC LIMIT 20;"

    Which indexes are actually being used and how often

  • Find unused indexes
    psql -U myuser -d mydb -c "SELECT schemaname, tablename, indexname, idx_scan FROM pg_stat_user_indexes WHERE idx_scan = 0 AND NOT indisprimary ORDER BY pg_relation_size(indexrelid) DESC;"

    Indexes that have never been scanned — safe to drop candidates

  • Dump database
    pg_dump -U myuser -d mydb -F c -f mydb.dump

    Custom-format dump (fastest, supports parallel restore)

  • Restore database
    pg_restore -U myuser -d mydb -j 4 --clean mydb.dump

    Parallel restore with 4 workers, drop existing objects first

  • Vacuum and analyze table
    psql -U myuser -d mydb -c 'VACUUM (VERBOSE, ANALYZE) orders;'

    Reclaim dead tuples and update statistics for query planner

all 29 postgres commands