Show table sizes postgres
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;"
more postgres
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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;"
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;"
Dump database
pg_dump -U myuser -d mydb -F c -f mydb.dump
Restore database
pg_restore -U myuser -d mydb -j 4 --clean mydb.dump
Vacuum and analyze table
psql -U myuser -d mydb -c 'VACUUM (VERBOSE, ANALYZE) orders;'