Oracle 彻底 kill session
為什么80%的碼農(nóng)都做不了架構(gòu)師？>>> ??
--***************************
-- Oracle 徹底 kill session
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? kill session 是DBA經(jīng)常碰到的事情之一。如果kill 掉了不該kill 的session，則具有破壞性，因此盡可能的避免這樣的錯(cuò)誤發(fā)生。同時(shí)也應(yīng)當(dāng)注意，
如果kill 的session屬于Oracle 后臺(tái)進(jìn)程，則容易導(dǎo)致數(shù)據(jù)庫實(shí)例宕機(jī)。
? 通常情況下，并不需要從操作系統(tǒng)級(jí)別殺掉Oracle會(huì)話進(jìn)程，但并非總是如此，下面的描述中給出了在Oracle級(jí)別殺掉會(huì)話以及操作系統(tǒng)級(jí)別殺掉進(jìn)程。
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一、獲得需要kill session的信息(使用V$SESSION 和 GV$SESSION視圖)
?
? SET LINESIZE 180
? COLUMN spid FORMAT A10
? COLUMN username FORMAT A10
? COLUMN program FORMAT A40
?
? SELECT s.inst_id,
???????? s.sid,
???????? s.serial#,
????? ???p.spid,
???????? s.username,
???????? s.program,
???????? s.paddr,
???????? s.STATUS
? FROM?? gv$session s
???????? JOIN gv$process p ON p.addr = s.paddr AND p.inst_id = s.inst_id
? WHERE? s.type != 'BACKGROUND';
?
???? INST_ID??????? SID??? SERIAL# SPID?????? USERNAME?? PROGRAM?????????????????????????????????????? PADDR??? STATUS
? ---------- ---------- ---------- ---------- ---------- --------------------------------------------- -------- --------
?????????? 1??????? 146???????? 23 27573????? TEST?? ????sqlplus@oracle10g (TNS V1-V3)???????????????? 4C621950 INACTIVE
?????????? 1??????? 160???????? 17 27610????? SYS??????? sqlplus@oracle10g (TNS V1-V3)???????????????? 4C624174 ACTIVE
?????????? 1??????? 144???????? 42 27641????? SCOTT????? sqlplus@oracle10g (TNS V1-V3)???????????????? 4C624730 INACTIVE
????????
二、使用ALTER SYSTEM KILL SESSION 命令實(shí)現(xiàn)
? 語法：
????? SQL> ALTER SYSTEM KILL SESSION 'sid,serial#';
????? SQL> ALTER SYSTEM KILL SESSION 'sid,serial#' IMMEDIATE;
????
??? 對(duì)于RAC環(huán)境下的kill session ,需要搞清楚需要kill 的session 位于哪個(gè)節(jié)點(diǎn)，可以查詢GV$SESSION視圖獲得。
??? kill session 的時(shí)候僅僅是將會(huì)話殺掉。在有些時(shí)候，由于較大的事務(wù)或需要運(yùn)行較長(zhǎng)的SQL語句將導(dǎo)致需要kill的session并不能立即殺掉。對(duì)于這種情
??? 況將收到 "marked for kill"提示(如下)，一旦會(huì)話當(dāng)前事務(wù)或操作完成，該會(huì)話被立即殺掉。
???
?? ?alter system kill session '4730,39171'
??? *
??? ERROR at line 1:
??? ORA-00031: session marked for kill
?
?
? 在下面的操作中將殺掉會(huì)話146，144
??? sys@AUSTIN> alter system kill session '146,23';
???
??? System altered.
???
??? sys@AUSTIN> alter system kill session '144,42';
???
??? System altered.
???
??? sys@AUSTIN> select inst_id,saddr,sid,serial#,paddr,username,status,program from gv$session where username is not null;
???
?????? INST_ID SADDR?????????? SID??? SERIAL# PADDR??? USERNAME?? STATUS?? PROGRAM
??? ---------- -------- ---------- ---------- -------- ---------- -------- ---------------------------------------------
?????????? ??1 4C70BF04??????? 144???????? 42 4C6545A0 SCOTT????? KILLED?? sqlplus@oracle10g (TNS V1-V3)
???????????? 1 4C70E6B4??????? 146???????? 23 4C6545A0 TEST?????? KILLED?? sqlplus@oracle10g (TNS V1-V3)
???????????? 1 4C71FC84??????? 160???????? 17 4C624174 SYS??????? ACTIVE?? sqlplus@oracle10g (TNS V1-V3)
?????????????????
???? 注意：在查詢中可以看到被殺掉的會(huì)話的PADDR地址發(fā)生了變化，參照查詢結(jié)果中的紅色字體。如果多個(gè)session被kill 掉，則多個(gè)session的PADDR
???? 被改為相同的進(jìn)程地址。
?
? 通過下面的語句來找回被kill 掉的ADDR先前的地址
??? SELECT s.username,s.status,
??? x.ADDR,x.KSLLAPSC,x.KSLLAPSN,x.KSLLASPO,x.KSLLID1R,x.KSLLRTYP,
??? decode(bitand (x.ksuprflg,2),,null,1)
??? FROM x$ksupr x,v$session s
??? WHERE s.paddr(+)=x.addr
??? and bitand(ksspaflg,1)!=;??????
???
??? USERNAME?? STATUS?? ADDR?????? KSLLAPSC?? KSLLAPSN KSLLASPO???? ??KSLLID1R KS D
??? ---------- -------- -------- ---------- ---------- ------------ ---------- -- -
?????????????? ACTIVE?? 4C623BB8???????? 99????????? 4 27468?????????????? 275 EV 1
?????????????? ACTIVE?? 4C623040????????? 9???????? 24 27444??????????? ???????? 1
?????????????? ACTIVE?? 4C622A84??????? 101????????? 4 27480?????????????? 274 EV 1
?????????????? ACTIVE?? 4C6224C8????????? 1???????? 48 27450???????????????? ??? 1
?????????????? ACTIVE?? 4C621F0C????????? 1???????? 48 27450??????????????? ???? 1
?????????????? ACTIVE?? 4C6235FC????????? 2????????? 4 27468???????????????? ??? 1
??? SYS??????? ACTIVE?? 4C624174????????? 2???????? 15 27442????????????????
?????????????? ACTIVE?? 4C62081C????????? 1???????? 48 27440???????????????? ??? 1
?????????????? ACTIVE?? 4C621394????????? 1???????? 48 27440???????????????? ??? 1
?????????????? ACTIVE?? 4C620DD8???????? 11???????? 24 27476???????????????? ??? 1
?????????????? ACTIVE?? 4C61F6E8???????? 15????????? 4 27610???????????????? ??? 1
???? ??????????ACTIVE?? 4C620260??????? 222???????? 24 27450???????????????? ??? 1
?????????????? ACTIVE?? 4C61FCA4????????? 7???????? 25 27573???????????????? ??? 1
?????????????? ACTIVE?? 4C61F12C????????? 6???????? 25 27573???????????????? ??? 1
???????? ??????ACTIVE?? 4C61EB70????????? 4???????? 24 27458???????????????? ??? 1
?????????????? ACTIVE?? 4C61E5B4????????? 1???????? 48 27440???????????????? ??? 1
?????????????? ACTIVE?? 4C61DFF8????????? 2???????? 24 27444???????????????? ??? 1
???????????? ???????????4C624730????????? ????????? ??????????????????????
??????????????????????? 4C621950????????? ????????? ??????????????????????
??????????????????????? 4C61DA3C????????? ????????? ??????????????????????
???????????????????
?
? 或者根據(jù)下面的語句來獲得發(fā)生變化的addr
??? sys@AUSTIN> select p.addr from v$process p where pid <> 1
????? 2? minus
????? 3? select s.paddr from v$session s;
???
??? ADDR
??? --------
??? 4C621950
??? 4C624730???????????????????
?
三、在操作系統(tǒng)級(jí)別殺掉會(huì)話
? 尋找會(huì)話對(duì)應(yīng)的操作系統(tǒng)的進(jìn)程ID
??? sys@AUSTIN> select SPID from? v$process where ADDR in ('4C621950','4C624730') ;????????
???
??? SPID
??? ----------
??? 27573
??? 27641
???
? 使用kill 命令來殺掉操作系統(tǒng)級(jí)別進(jìn)程ID
??? kill session -9 27573
???
??? kill session -9 27641
?
四、獲得當(dāng)前會(huì)話的SID
? SQL> select userenv('sid') from dual;
?
? USERENV('SID')
? --------------
???????????? 627
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五、多個(gè)會(huì)話需要kill 的處理辦法
? 1.根據(jù)給定的SID(用戶名)查找需要殺掉會(huì)話的信息，包括位于哪一個(gè)實(shí)例
??? set linesize 160
??? col program format a35
??? col username format a18
??? select inst_id,saddr,sid,serial#,paddr,username,status,program from gv$session
??? where sid in ('2731','2734','2720','2678','2685')
??? and username='CTICUST'
??? order by inst_id;
???
?????? INST_ID SADDR?????????????????? SID??? SERIAL# PADDR??????????? USERNAME?????????? STATUS?? PROGRAM
??? ---------- ---------------- ---------- ---------- ---------------- ------------------ -------- ---------------------------
???????????? 1 00000003DAF8F870?????? 2678?????? 8265 00000003DBC6CA08 MSS4USR??????????? INACTIVE JDBC Thin Client
???????????? 1 00000003DAF98E48?????? 2685???????? 83 00000003DBC08510 MSS4USR??????????? ACTIVE?? JDBC Thin Client
???????????? 1 00000003DAFC7B80?????? 2720????????? 5 00000003DBBEDA20 MSS4USR??????????? INACTIVE JDBC Thin Client
???????????? 1 00000003DAFD66F8?????? 2731????????? 3 00000003DBBE9AE0 SYS??????????????? ACTIVE? racgimon@svdg0028(TNS V1-V3)
???????????? 1 00000003DAFDA730?????? 2734???????? 15 00000003DBBEC268 MSS4USR??????????? INACTIVE JDBC Thin Client
???????????? 2 00000003DAFD66F8?????? 2731????????? 1 00000003DBBE92F8??????????????????? ACTIVE?? oracle@svdg0029 (ARC0)
???
??? 上面的查詢中有一個(gè)SID為2731的位于節(jié)點(diǎn)2上。
??? 也可以通過下面的方式來獲得RAC的節(jié)點(diǎn)信息，便于確定需要kill 的session究竟位于哪一個(gè)節(jié)點(diǎn)。
???
????? set linesize 160
????? col HOST_NAME format a25
????? SQL> select INSTANCE_NUMBER,INSTANCE_NAME,HOST_NAME,VERSION,STATUS from gv$instance order by 1;
?
????? INSTANCE_NUMBER INSTANCE_NAME??? HOST_NAME???????????????? VERSION?????????? STATUS
????? --------------- ---------------- ------------------------- ----------------- ------------
??? ????????????????1 O02WMT1A???????? svd0051????????????????? 10.2.0.4.0??????? OPEN
??????????????????? 2 O02WMT1B???????? svd0052????????????????? 10.2.0.4.0??????? OPEN
??????????????????? 3 O02WMT1C???????? svd0053????????????????? 10.2.0.4.0??????? OPEN
???????????????????
? 2.使用下面查詢來生成kill session 的語句
??? select 'alter system kill session '''|| sid ||',' ||SERIAL# ||''''||';'? from ?gv$session
??? where sid in ('2731','2734','2720','2678','2685')
??? order by inst_id;
?????
??? 獲得下列kill session的語句，根據(jù)要求由于此次需要殺掉的session全部位于節(jié)點(diǎn)1，因此登錄到節(jié)點(diǎn)節(jié)點(diǎn)1執(zhí)行下面的語句??
????????
??? alter system kill session '2678,8265';
???
??? alter system kill session '2685,83';
???
??? alter system kill session '2720,5';?
???
??? alter system kill session '2731,3';
????
??? alter system kill session '2734,15';
????
??? alter system kill session '2731,1';??? --此條命令不需要執(zhí)行，該session位于節(jié)點(diǎn)2。
????????????
六、有關(guān)kill session的參考：
? Oracle How To:如何快速殺死占用過多資源(CPU,內(nèi)存)的數(shù)據(jù)庫進(jìn)程? ?
? Oracle中Kill session的研究
? Killing Oracle Sessions
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七、更多參考：
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有關(guān)性能優(yōu)化請(qǐng)參考
Oracle 硬解析與軟解析
共享池的調(diào)整與優(yōu)化(Shared pool Tuning)
Buffer cache 的調(diào)整與優(yōu)化(一)
Oracle 表緩存(caching table)的使用
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有關(guān)閃回特性請(qǐng)參考
Oracle 閃回特性(FLASHBACK DATABASE)
Oracle 閃回特性(FLASHBACK DROP & RECYCLEBIN)
Oracle 閃回特性(Flashback Query、Flashback Table)
Oracle 閃回特性(Flashback Version、Flashback Transaction)
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有關(guān)基于用戶管理的備份和備份恢復(fù)的概念請(qǐng)參考
Oracle 冷備份
Oracle 熱備份
Oracle 備份恢復(fù)概念
Oracle 實(shí)例恢復(fù)
Oracle 基于用戶管理恢復(fù)的處理(詳細(xì)描述了介質(zhì)恢復(fù)及其處理)
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有關(guān)RMAN的恢復(fù)與管理請(qǐng)參考
RMAN 概述及其體系結(jié)構(gòu)
RMAN 配置、監(jiān)控與管理
RMAN 備份詳解
RMAN 還原與恢復(fù)
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原文鏈接： http://blog.csdn.net/robinson_0612/article/details/6439019
轉(zhuǎn)載于:https://my.oschina.net/dtec/blog/47358
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