Home Database Mysql Tutorial Oracle锁表故障处理一例

Oracle锁表故障处理一例

Jun 07, 2016 pm 04:46 PM
oracle lock table

一次开发人员直接在数据库服务器上做deletetable操作系统,由时在上班高峰运行,造成长时间执行无反应,进而把SQLPLUS客户端关闭掉,再次运行删除语句,造成数据

一次开发人员直接在数据库服务器上做delete table操作系统,由时在上班高峰运行,造成长时间执行无反应,进而把SQLPLUS客户端关闭掉,再次运行删除语句,造成数据库运行缓慢。  
询问操作过程知道了是由锁表造成,,最终处理;本文只是模拟锁表处理过程,下次遇到相同问题可以快速处理。

1. 查看数据库的等待事件

如果不清楚原因,可以通过先通过等待事件进行分析。

SQL> select sid,EVENT from v$session_wait where wait_class'Idle';

       SID EVENT  
---------- ----------------------------------------------------------------    
       158 SQL*Net message to client    
       159 enq: TX - row lock contention    
SQL>

 

2. 查看数据库是否有锁

SQL> select * from v$lock where block=1;

 

3. 查询lock锁, 看谁锁谁

说明:BLOCK为1的行,表示资源由它锁定。REQUEST表示需要这个锁。

SQL> SELECT sid, id1, id2, lmode, block,request, type    
FROM V$LOCK    
WHERE id1 IN (SELECT id1 FROM V$LOCK WHERE lmode = 0)    
ORDER BY id1, request;

       SID        ID1        ID2      LMODE      BLOCK    REQUEST TY  
---------- ---------- ---------- ---------- ---------- ---------- --    
       153     655397        308          6          1          0 TX    
       157     655397        308          0          0          6 TX

 

4. 查询锁表的SID,Serial#,用户、开始时间,然后就可以杀掉该进程了。

SQL> select t1.sid,t1.serial#,t1.username,t1.logon_time from v$session t1,v$locked_object t2 where t1.sid = t2.session_id order by t1.logon_time ;

       SID    SERIAL# USERNAME                       LOGON_TIME  
---------- ---------- ------------------------------ -------------------    
       153         12 ABC                            2014-11-17 09:19:33    
       157        106 ABC                            2014-11-17 09:54:24

 

5. 可以进一步查询出SID,SPID等信息

SQL> select s.username, s.osuser, s.sid, s.serial#, p.spid, s.program,s.STATUS 
from v$session s,v$process p 
where s.paddr = p.addr and s.username is not null; 

USERNAME                       OSUSER                                SID    SERIAL# SPID         PROGRAM                                          STATUS  
------------------------------ ------------------------------ ---------- ---------- ------------ ------------------------------------------------ --------    
ABC                            oracle                                153         12 4290         sqlplus@oradb (TNS V1-V3)                        INACTIVE    
SYS                            oracle                                150         12 4417         sqlplus@oradb (TNS V1-V3)                        ACTIVE    
ABC                            oracle                                157        119 4830         sqlplus@oradb (TNS V1-V3)                        ACTIVE

要么在oracle进行杀掉,以及在操作系统下杀掉,对于status为killed的语句,应用通过操作系统kill命令才能最终最快杀掉。

alter system kill session  '153,12';  
alter system kill session  '157,119';

或操作系统中

kill -9 4290  
kill -9 4830

 

6.  查询被锁的表的SID及相关资源

说明:出被锁的表及SQL,还是要结合上面的查询进行手工处理, 也可以通过SID找到SQL语句。

set pagesize 999;  
set linesize 200;    
col PROGRAM for a25;    
col TERMINAL for a10;

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