PostgreSQLでテーブルのレコード数とテーブルサイズを計算する

calculate-pg-table-size.sql

SELECT a.table_name, pg_relation_size(a.table_name) AS size, b.count FROM information_schema.tables AS a
INNER JOIN (
SELECT relname, n_tup_ins - n_tup_del as count FROM pg_stat_all_tables
) AS b
ON b.relname = a.table_name
WHERE a.table_schema = 'public'
ORDER BY size DESC;