常用SQL查询

-- 远程连接
psql -U kong -p 5432 -h 10.0.0.10 -w

-- 所有数据库大小
select datname,pg_size_pretty(pg_database_size(datname)) from pg_database;

-- 查看指定数据库大小
select pg_size_pretty(pg_database_size('app01'));

-- 表大小
select pg_size_pretty(pg_relation_size('t1'));

-- 表和索引大小
select pg_size_pretty(pg_total_relation_size('t1'));

-- 查看数据分布情况和磁盘空间
select dfhostname,dfspace,dfdevice from gp_toolkit.gp_disk_free order by dfhostname;