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标签归档:ORA-27054
使用alter system events导致库crash
由于数据库导入大量数据的时候io等待比较高,新的存储无法直接挂过来,考虑使用nfs挂载过来,然后存放redo缓解io压力。
数据库版本信息
SQL> select * from v$version; BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi PL/SQL Release 10.2.0.4.0 - Production CORE 10.2.0.4.0 Production TNS for IBM/AIX RISC System/6000: Version 10.2.0.4.0 - Productio NLSRTL Version 10.2.0.4.0 - Production
挂载参数(mount命令查看)
10.240.10.1 /top/data4/nfs /back1 nfs3 Aug 29 13:40 cio,rw,bg,hard,nointr,rsize=32768,wsize=32768,proto=tcp,noac,vers=3,timeo=600
尝试创建redo
SQL> alter database add logfile group 13 ('/back/newxff/redo13.log') size 2048m; alter database add logfile group 13 ('/back1/newxff/redo13.log') size 2048m * ERROR at line 1: ORA-00301: error in adding log file '/back1/newxff/redo13.log' - file cannot be created ORA-27054: NFS file system where the file is created or resides is not mounted with correct options Additional information: 6
根据mos文档
ORA-27054 ERRORS WHEN RUNNING RMAN WITH NFS (文档 ID 387700.1)
SQL> Alter system set events '10298 trace name context forever,level 32'; System altered. Mon Sep 5 10:10:18 2016 Thread 1 advanced to log sequence 109 (LGWR switch) Current log# 1 seq# 109 mem# 0: +DATA/xff/onlinelog/group_1.257.921671023 Mon Sep 5 10:12:19 2016 OS Pid: 160710 executed alter system set events '10298 trace name context forever,level 32'
创建redo成功
SQL> alter database add logfile group 13 ('/back1/newxff/redo13.log') size 2048m; System altered. Mon Sep 5 10:18:13 2016 alter database add logfile group 13 ('/back1/newxff/redo13.log') size 2048m Mon Sep 5 10:18:43 2016 Completed: alter database add logfile group 13 ('/back1/newxff/redo13.log') size 2048m
数据库crash
Mon Sep 5 10:19:06 2016 Errors in file /opt/oracle/admin/xff/bdump/xff1_lgwr_246566.trc: ORA-00313: open failed for members of log group 13 of thread 1 ORA-00312: online log 13 thread 1: '/back1/newxff/redo13.log' ORA-27054: NFS file system where the file is created or resides is not mounted with correct options Additional information: 6 Mon Sep 5 10:19:06 2016 Errors in file /opt/oracle/admin/xff/bdump/xff1_lgwr_246566.trc: ORA-00313: open failed for members of log group 13 of thread 1 ORA-00312: online log 13 thread 1: '/back1/newxff/redo13.log' ORA-27054: NFS file system where the file is created or resides is not mounted with correct options Additional information: 6 Mon Sep 5 10:19:06 2016 LGWR: terminating instance due to error 313 Mon Sep 5 10:19:06 2016 System state dump is made for local instance System State dumped to trace file /opt/oracle/admin/xff/bdump/xff1_diag_299654.trc
通过报错很明显可以看出来数据库挂掉的原因和当时不能创建redo的原因一样,都是由于ORA-27054导致数据库挂了,但是为什么创建redo成功,但是使用redo失败呢?
这里需要注意使用的命令是events,而这个命令是对当前会话和后续新建的会话生效,也就是说他不会对数据库已经存在的后台进程生效,那也就可以理解了,我创建redo是在执行events的当前命令行窗口处理的,因此可以创建成功;但是lgwr进程是数据库一启动就存在的进程,现在设置的events对他没有影响,因此当lgwr去使用redo的时候无法正常使用因此就导致数据库crash掉。如果希望event对已经存在的进程生效,可以考虑使用oradebug对进程进行设置event(这个案例主要要设置多个后台进程不光lgwr访问redo),或者设置event=的方式,然后重启数据库让其生效。