PostgreSQL:暂时禁用连接

Question

我在PostgreSQL中有一个脚本,每晚都会从转储中恢复测试数据库.应用程序服务器和具有连接池的进程可以访问数据库,从而始终保持一些连接处于活动状态.

所以脚本恢复转储my_temp_database.那么它应该改名my_database来my_old_database,my_temp_database来my_database,并最终下降my_old_database.

如何断开所有客户端,超级用户与否my_database,以便可以重命名？我怎么能暂时阻止他们重新连接？

有没有更好的方法来做我需要的？

Answer 1

To mark database 'applogs' as not accepting new connections:

update pg_database set datallowconn = false where datname = 'applogs';

Another possibility would be to revoke 'connect' access on the database for the client role(s).

Disconnect users from database = kill backend. So to disconnect all other users from "applogs" database, for example:

select pg_terminate_backend(procpid)
from pg_stat_activity
where datname = 'applogs' and procpid <> pg_backend_pid();

Once you've done both of those, you are the only user connected to 'applogs'. Although there might actually be a delay before the backends actually finish disconnecting?

Answer 2

终止当前活动连接后,您还可以发出此命令,该命令仅允许超级用户登录.这假设您可以访问所有仍具有访问权限的超级用户.希望您不会向任何人分发超级用户权限.

ALTER DATABASE your_db CONNECTION LIMIT 0;

Answer 3

从 PostgreSQL 9.5 开始，我们终于可以：

ALTER DATABASE db WITH ALLOW_CONNECTIONS false;