database - 杀死一个 postgresql session /连接

Question

如何终止我所有的 postgresql 连接？

我正在尝试 rake db:drop 但我得到:

ERROR:  database "database_name" is being accessed by other users
DETAIL:  There are 1 other session(s) using the database.

我已经尝试关闭从 ps -ef | 中看到的进程grep postgres 但这也不起作用:

kill: kill 2358 failed: operation not permitted

Answer 1

您可以使用 pg_terminate_backend()杀死一个连接。您必须是 super 用户才能使用此功能。这在所有操作系统上都一样。

SELECT 
    pg_terminate_backend(pid) 
FROM 
    pg_stat_activity 
WHERE 
    -- don't kill my own connection!
    pid <> pg_backend_pid()
    -- don't kill the connections to other databases
    AND datname = 'database_name'
    ;

在执行此查询之前，您必须 REVOKE避免新连接的 CONNECT 权限:

REVOKE CONNECT ON DATABASE dbname FROM PUBLIC, username;

If you're using Postgres 8.4-9.1 use procpid instead of pid

SELECT 
    pg_terminate_backend(procpid) 
FROM 
    pg_stat_activity 
WHERE 
    -- don't kill my own connection!
    procpid <> pg_backend_pid()
    -- don't kill the connections to other databases
    AND datname = 'database_name'
    ;