1、查询数据库版本
select version();
2、查询数据库的运行时间
select current_timestamp-pg_postmaster_start_time() as uptime;
3、查询数据库的数据量
SELECT
datname , a.rolname , pg_encoding_to_char(encoding) , datcollate , datctype , pg_size_pretty(pg_database_size(datname))
FROM
pg_database d , pg_authid a
WHERE
d.datdba = a.oid AND datname NOT IN (\'template0\' ,\'template1\' ,\'postgres\' )
ORDER BY
pg_database_size(datname) DESC;
4、 查询手游数据库连接数使用情况
SELECT
s.setting \"可用连接数\" , a.used_session \"已使用连接数\" , s.setting::bigintwww.diuxie.com - a.used_session \"剩余连接数\"
FROM
pg_settings s, ( SELECT COUNT(*) AS used_session FROM pg_stat_activity) a
WHERE
s.name=\'max_connections\';
5、查询数据库参数配置
select name,setting,unit from pg_settings;
6、查询当前数据库
select current_database();