postgres 查詢數據庫佔空間大小

查詢對應數據庫的大小：

select pg_database.datname, pg_size_pretty(pg_database_size(pg_database.datname)) AS size from pg_database where datname = 'dbname';

postgres 回收孤立的大對象垃圾：

vacuumlo -h IP -p 5432 -U postgres  dbname