postgres-后台常用命令筆記

1、斷開數據庫的所有連接

select pg_terminate_backend(pid) from (select pid from pg_stat_activity where datname = 'xxx' ) a;

用於刪庫時提示：database "xxx" is being accessed by other users 詳細：There are 2 other sessions using the database. 

2、查看長事務並殺掉長事務會話

SELECT * FROM pg_stat_activity

WHERE STATE <> 'idle'

        AND pg_backend_pid () != pid

        AND ( backend_xid IS NOT NULL OR backend_xmin IS NOT NULL )

        AND EXTRACT (epoch FROM ( now() - xact_start )) > 60

ORDER BY xact_start;　　

select pg_terminate_backend(pid)；pid為上一個結果集中的pid

3、殺掉空閑語句

select pg_terminate_backend(pid) from pg_stat_activity where state='idle';

4、批量造數據

INSERT INTO tbl_name ( column1, column2,column3,column4 ) 
SELECT generate_series ( 1, 100000 ),md5( random() :: TEXT ),clock_timestamp(),RANDOM();