HGDB怎么获取数据库的运维信息

环境

系统平台：Microsoft Windows (64-bit) 2012
版本：5.6.5

文档用途

列举了一些用来获取运维信息的SQL语句

详细信息

查看当前所有连接数：

select count(*),usename from pg_stat_activity group by usename;

查看负载：

select * from pg_stat_activity;

查看单个数据库（highgo）大小：

select pg_size_pretty(pg_database_size('highgo')) as size;

查看所有数据库大小：

select datname,pg_size_pretty(pg_database_size(datname)) as size from pg_database;

查看单个数据表（test）大小：

select pg_size_pretty(pg_relation_size('test')) as size;

查看所有数据表大小：

select relname,pg_size_pretty(pg_relation_size(relid)) as size from pg_stat_user_tables;