一个BUG导致MMON进程down掉

一个BUG导致MMON进程down掉

今天下班前检查alert日志文件，发现在中午的时候MMON进程死了，并自动重启，错误信息如下：
KEBM: MMON action policy violation. 'Flashback Archive RAC Health Check'
 viol=0; err=8181
 error 8181 detected in background process
 OPIRIP: Uncaught error 447. Error stack:
 ORA-00447: fatal error in background process
 ORA-08181: specified number is not a valid system change number
 ORA-12751: cpu time or run time policy violation
 
经过查询，此问题为ORACLE 一个BUG引起，BUG号为：10207092，影响的版本为：11.1.0.7（正是我们数据库的版本）和11.2.0.2
MMON进程解释：
MMON:Manageability Monitor Process Performs or schedules many manageability tasks MMON performs many tasks related to manageability, including taking Automatic Workload Repository snapshots and performing Automatic Database Diagnostic Monitor analysis.   以下是metalink上的说明： Bug 10207092  MMON may repeatedly fail with ORA-447 / ORA-12751  This note gives a brief overview of bug 10207092.   The content was last updated on: 14-AUG-2012  Click here for details of each of the sections below. Affects: Product (Component)  Oracle Server (Rdbms) Range of versions believed to be affected  Versions >= 11 but BELOW 12.1 Versions confirmed as being affected  11.2.0.2 11.1.0.7  Platforms affected  Generic (all / most platforms affected) Fixed: This issue is fixed in  12.1 (Future Release) 11.2.0.3 (Server Patch Set) 11.2.0.2.7 Patch Set Update 11.2.0.2 Bundle Patch 2 for Exadata Database 11.2.0.2 Patch 14 on Windows Platforms  Symptoms:  Related To:  Error May Occur Unwanted or Excess Trace / Alert messages ORA-12751 / ORA-447 Job Queues  Description
Scheduler code in MMON suppresses an error which can result in an MMON
dump.
eg:
 KEBM: MMON action policy violation. 'Flashback Archive RAC Health Check'
 viol=0; err=8181
 error 8181 detected in background process
 OPIRIP: Uncaught error 447. Error stack:
 ORA-00447: fatal error in background process
 ORA-08181: specified number is not a valid system change number
 ORA-12751: cpu time or run time policy violation
 
Rediscovery Notes:
  MMON keeps failing with ORA-12751 and ORA-447 on the error stackWorkaroundNone
Please note: The above is a summary description only. Actual symptoms can vary. Matching to any symptoms here does not confirm that you are encountering this problem. For questions about this bug please consult Oracle Support. References Bug:10207092  (This link will only work for PUBLISHED bugs)  Note:245840.1  Information on the sections in this article