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                         今天遇到一个AIX系统BUG,Oracle数据库无法启动,甚至无法Nomount,实例在Nomount之后马上Crash。  报告的错误是PMON无法启动。  告警日志信息摘录: 
 
  PMON started with pid=2,OS id=295272  Sun Dec 2 21:33:20 2007  Errors in file /oracle/admin/oinst/bdump/oinst_pmon_295272.trc:  ORA-07445: exception encountered: core dump [] [] [] [] [] []  PSP0 started with pid=3,OS id=336364  MMAN started with pid=4,OS id=385228  DBW0 started with pid=5,OS id=389154  DBW1 started with pid=6,OS id=360558  DBW2 started with pid=7,OS id=340122  DBW3 started with pid=8,OS id=274592  LGWR started with pid=9,OS id=172072  CKPT started with pid=10,OS id=151578  SMON started with pid=11,OS id=369006  RECO started with pid=12,OS id=315902  CJQ0 started with pid=13,OS id=463090  MMON started with pid=14,OS id=299320  MMNL started with pid=15,OS id=278948  Sun Dec 2 21:33:23 2007  PSP0: terminating instance due to error 472  Instance terminated by PSP0,pid = 336364 
  最后确定疑似Oracle的一个Bug,BUG Number:6413391  对于这个BUG,Oracle建议的修正是Apply ML06 to AIX 5.3 
  而客户的系统目前看来ML06的安装是不完全的: 
 
  instfix -i|grep ML  All filesets for 5.3.0.0_AIX_ML were found.  All filesets for 5300-01_AIX_ML were found.  All filesets for 5300-02_AIX_ML were found.  All filesets for 5300-03_AIX_ML were found.  All filesets for 5300-04_AIX_ML were found.  All filesets for 5300-05_AIX_ML were found.  Not all filesets for 5300-06_AIX_ML were found. 
  不完全的补丁安装是危险的,在进行系统升级时一定要慎重,最好将系统运行在经过验证的稳定的系统版本上,升级过快可能会带来更多的不稳定因素。 
 
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