今早发现oracle数据库宕库 ，重新启动数据库正常，之后查询alter日志发现在

23点出现 PMON (ospid: 2853): terminating the instance due to error 471 导致数据库停止

日志截图 alter log日志

Wed Mar 08 23:36:02 2017
System state dump requested by (instance=1, osid=2853 (PMON)), summary=[abnormal instance termination].
System State dumped to trace file /app/oracle/diag/rdbms/oracle11/oracle11/trace/oracle11_diag_2871.trc
Wed Mar 08 23:36:02 2017

2，查看了下/var/log/message 系统日志

发现是超内存

3，找到原因，接下来查看内存使用情况

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PMON (ospid: 2853): terminating the instance due to error 471