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ORACLE快速彻底Kill掉的会话（转载）

2015-02-26 10:33 393 查看

[code]SQL>connetl/etl

Connected.

SQL>updatetestsetstatus='invalid';

55944rowsupdated.

SQL>updatetest2setdropped='Y';

3090rowsupdated.

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[/code]
会话2：


[code]
[code]

SQL>showuser

USERis"SYS"

SQL>updateetl.test2setdropped='Y';

3090rowsupdated.

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[/code]
会话3


[code]
[code]

SQL>selectsaddr,sid,serial#,paddr,username,statusfromv$sessionwhereusername=upper('etl')orusername=upper('sys');

SADDRSIDSERIAL#PADDRUSERNAMESTATUS

------------------------------------------------------------------------------------------

000000025C233B002733353000000025F1D1FC8ETLINACTIVE

000000025C23A6083711448000000025F1D27B0SYSACTIVE

000000025C24BC506354311000000025F1D5F08SYSACTIVE

SQL>altersystemkillsession'27,33353';

Systemaltered.

SQL>selectsaddr,sid,serial#,paddr,username,statusfromv$sessionwhereusername=upper('etl')orusername=upper('sys');

SADDRSIDSERIAL#PADDRUSERNAMESTATUS

------------------------------------------------------------------------------------------

000000025C233B002733353000000025C21A0B0ETLKILLED

000000025C23A6083711448000000025F1D27B0SYSACTIVE

000000025C24BC506354311000000025F1D5F08SYSINACTIVE

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如下所示，我杀掉了其中两个会话后，这两个会话的地址都变为000000025C21A0B0了（请见PADDR列）。当在Oracle中killsession以后,Oracle只是简单的把相关session的paddr指向同一个虚拟地址.此时v$process和v$session失去关联,进程就此中断。然后Oracle就等待PMON去清除这些Session.所以通常等待一个被标记为Killed的Session退出需要花费很长的时间.如果此时被Kill的process，重新尝试执行任务，那么马上会收到进程中断的提示，process退出，此时Oracle会立即启动PMON来清除该session.这被作为一次异常中断处理.


[code]
[code]SQL>altersystemkillsession'63,54311';

Systemaltered.

SQL>selectsaddr,sid,serial#,paddr,username,status

fromv$sessionwhereusername=upper('etl')orusername=upper('sys');

SADDRSIDSERIAL#PADDRUSERNAMESTATUS

------------------------------------------------------------------------------------------

000000025C233B002733353000000025C21A0B0ETLKILLED

000000025C23A6083711448000000025F1D27B0SYSACTIVE

000000025C24BC506354311000000025C21A0B0SYSKILLED

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我们根据下面SQL找到进程的地址，然后在v$process里面找到对应的spid,然后从操作系统中杀掉该进程。


[code]
[code]SQL>selectp.addrfromv$processpwherepid<>1

2minus

3selects.paddrfromv$sessions;

ADDR

----------------

000000025F1D1FC8

000000025F1D5F08

SQL>selectsaddr,sid,serial#,paddr,username,statusfromv$session

whereusername=upper('etl')orusername=upper('sys');

SADDRSIDSERIAL#PADDRUSERNAMESTATUS

------------------------------------------------------------------------------------------

000000025C233B002733353000000025C21A0B0ETLKILLED

000000025C23A6083711448000000025F1D27B0SYSACTIVE

000000025C24BC506354311000000025C21A0B0SYSKILLED

SQL>selectaddr,pid,spid,usernamefromv$processwhereaddrin('000000025F1D1FC8','000000025F1D5F08');

ADDRPIDSPIDUSERNAME

-----------------------------------------------------

000000025F1D1FC82212959oracle

000000025F1D5F083812971oracle

SQL>!kill-912959

SQL>!kill-912971

SQL>selectsaddr,sid,serial#,paddr,username,status

fromv$sessionwhereusername=upper('etl')orusername=upper('sys');

SADDRSIDSERIAL#PADDRUSERNAMESTATUS

------------------------------------------------------------------------------------------

000000025C23A6083711448000000025F1D27B0SYSACTIVE

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在ORACLE数据库杀掉会话进程有三种方式：

1：ALTERSYSTEMKILLSESSION

关于KILLSESSIONClause，如下官方文档描述所示，altersystemkillsession实际上不是真正的杀死会话，它只是将会话标记为终止。等待PMON进程来清除会话。


[code]
[code]TheKILLSESSIONclauseletsyoumarkasessionasterminated,rollbackongoingtransactions,releaseallsessionlocks,andpartiallyrecoversessionresources.Tousethisclause,yourinstancemusthavethedatabaseopen.Yoursessionandthesessiontobeterminatedmustbeonthesameinstanceunlessyouspecifyinteger3.YoumustidentifythesessionwiththefollowingvaluesfromtheV$SESSIONview:

Forinteger1,specifythevalueoftheSIDcolumn.

Forinteger2,specifythevalueoftheSERIAL#column.

Fortheoptionalinteger3,specifytheIDoftheinstancewherethetargetsessiontobekilledexists.YoucanfindtheinstanceIDbyqueryingtheGV$tables.

Ifthesessionisperformingsomeactivitythatmustbecompleted,suchaswaitingforareplyfromaremotedatabaseorrollingbackatransaction,thenOracleDatabasewaitsforthisactivitytocomplete,marksthesessionasterminated,andthenreturnscontroltoyou.Ifthewaitinglastsaminute,thenOracleDatabasemarksthesessiontobeterminatedandreturnscontroltoyouwithamessagethatthesessionismarkedtobeterminated.ThePMONbackgroundprocessthenmarksthesessionasterminatedwhentheactivityiscomplete.

Whetherornotthesessionhasanongoingtransaction,OracleDatabasedoesnotrecovertheentiresessionstateuntilthesessionuserissuesarequesttothesessionandreceivesamessagethatthesessionhasbeenterminated.

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可以使用ALTERSYSTEMKILLSESSION'sid,serial#'IMMEDIATE来快速回滚事物、释放会话的相关锁、立即返回当前会话的控制权。

SpecifyIMMEDIATEtoinstructOracleDatabasetorollbackongoingtransactions,releaseallsessionlocks,recovertheentiresessionstate,andreturncontroltoyouimmediately.

2：ALTERSYSTEMDISCONNECTSESSION

ALTERSYSTEMDISCONNECTSESSION杀掉专用服务器(DEDICATEDSERVER)或共享服务器的连接会话，它等价于从操作系统杀掉进程。它有两个选项POST_TRANSACTION和IMMEDIATE，其中POST_TRANSACTION表示等待事务完成后断开会话，IMMEDIATE表示中断会话，立即回滚事务。

SQL>ALTERSYSTEMDISCONNECTSESSION'sid,serial#'POST_TRANSACTION;

SQL>ALTERSYSTEMDISCONNECTSESSION'sid,serial#'IMMEDIATE;

3：KILL-9SPID（Linux）或orakillORACLE_SIDspid　（Windows）

可以使用下面SQL语句找到对应的操作系统进程SPID，然后杀掉。当然杀掉操作系统进程是一件危险的事情，尤其不要误杀。所以在执行前，一定要谨慎确认。


[code]
[code]SETLINESIZE100

COLUMNspidFORMATA10

COLUMNusernameFORMATA10

COLUMNprogramFORMATA45

SELECTs.inst_id,

s.sid,

s.serial#,

p.spid,

s.username,

s.program

FROMgv$sessions

JOINgv$processpONp.addr=s.paddrANDp.inst_id=s.inst_id

WHEREs.type!='BACKGROUND';

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[/code]

在数据库如果要彻底杀掉一个会话，尤其是大事务会话，最好是使用ALTERSYSTEMDISCONNECTSESSIONIMMEDIATE或使用下面步骤：

1：首先在操作系统级别Kill掉进程。

2：在数据库内部KILLSESSION

或者反过来亦可。这样可以快速终止进程，释放资源。

参考资料：

http://www.eygle.com/faq/Kill_Session.htm

http://www.oracle-base.com/articles/misc/killing-oracle-sessions.php#unix

http://www.eygle.com/archives/2005/10/oracle_howto_kill_session.html

http://blog.sina.com.cn/s/blog_6d6e54f70100zfqp.html

http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_2013.htm#SQLRF53047

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