1.查找某shema下所有表占用的空間
select schemaname,tablename,round(sum(pg_total_relation_size(schemaname||','||tablename))/1024/1024/1024,2) as tablesize_G from pg_tables where schemaname in ('edc_wg') group by 1,2 order by tablesize_G desc;
2.查詢單表占用空間
select pg_size_pretty(pg_total_relation_size('tb_name'));
