Memo on PSQL
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database size
SELECT pg_size_pretty(pg_database_size('DB_NAME'));
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table size
SELECT nspname || '.' || relname AS "relation", pg_size_pretty(pg_relation_size(C.oid)) AS "size" FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace) WHERE nspname NOT IN ('pg_catalog', 'information_schema') ORDER BY pg_relation_size(C.oid) DESC LIMIT 20;
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find table name with pattern
SELECT table_name FROM information_schema.tables WHERE table_schema = 'public' AND table_name LIKE '%PATTERN%';