pgsql 连接数查看、释放

• 查询当前连接

select * from pg_stat_activity;
select count(1) from pg_stat_activity;select pid, datname, application_name, client_addr, state from pg_stat_activity where state in ('idle', 'active');

• 查询最大连接数

show max_connections;
SELECT name, setting FROM pg_settings WHERE name = 'max_connections';

• 释放空闲连接

SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE state='idle';

SELECT pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE state = 'idle'  -- 或者 'idle in transaction'AND pid <> pg_backend_pid();  -- 避免断开自己的连接