如何快速殺死占用過多資源(CPU,內(nèi)存)的數(shù)據(jù)庫進程_MySQL

但是此命令釋放資源極為緩慢，具體可以參考:Oracle中Kill session的研究.
為了更快速的釋放資源，通常我們使用如下步驟來Kill進程:
1.首先在操作系統(tǒng)級kill進程
2.在數(shù)據(jù)庫內(nèi)部kill session
這樣通?？梢钥焖僦兄惯M程，釋放資源。

今天就遇到這樣一個案例，其他朋友在數(shù)據(jù)庫里kill session,可是長時間仍無效果:
[oracle@danaly ~]$ sqlplus "/ as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Oct 27 11:09:50 2005

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options

SQL> select sid,username,status from v$session;

SID USERNAME STATUS
---------- ------------------------------ --------
....
154 SCOTT KILLED
...

30 rows selected.

那按照我前面提到的步驟，首先查詢得到該session對應(yīng)的OS進程號:
SQL> select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=&sid);
Enter value for sid: 154
old 1: select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=&sid)
new 1: select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=154)

'KILL-9'||SPID
--------------------
kill -9 22702

SQL> !

在操作系統(tǒng)級kill該進程:
[oracle@danaly ~]$ ps -ef|grep 22702
oracle 22702 1 0 Oct25 ? 00:00:02 oracledanaly (LOCAL=NO)
oracle 12082 12063 0 11:12 pts/1 00:00:00 grep 22702
[oracle@danaly ~]$ kill -9 22702
[oracle@danaly ~]$ ps -ef|grep 22702
oracle 12088 12063 0 11:12 pts/1 00:00:00 grep 22702
[oracle@danaly ~]$ exit
exit

SQL> select sid,username,status from v$session;

SID USERNAME STATUS
---------- ------------------------------ --------
...
154 SCOTT KILLED
...

30 rows selected.

SQL> select sid,serial#,username from v$session where sid=154;

SID SERIAL# USERNAME
---------- ---------- ------------------------------
154 56090 SCOTT

再次在數(shù)據(jù)庫中kill該session,并指定immediate選項:
SQL> alter system kill session '154,56090' immediate;

System altered.

SQL> select sid,serial#,username from v$session where sid=154;

no rows selected

此時該進程被迅速清除。

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