PostgreSQL 常用维护操作
1. 查看数据库到目前为止启动时长。 kevin_test=# SELECT date_trunc(
1. 查看数据库到目前为止启动时长。
2.查看启动时间。
3,pg的server控制文件pg_controldata，，此文件为初始化数据库时产生，有的字段随时更新，请不要试图手工修改它。
4.查询结果输出格式控制 \x [on|off]选项
4.查看当前数据库中有多少张用户自己的表。
附：视图information_schema.tables的结构。
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