oom killer 导致 oracle instance 崩溃

os: centos 7.6
db: oracle 19.3

oracle 不支持在 ubuntu 上安装,但是修修改改也可以安装.测试环境倒无所谓,生产环境一定不要安装在ubuntu上.

今早看到测试环境的一台oracle机器实例宕掉

Mon Jun 17 07:46:57 2019
Thread 1 advanced to log sequence 3187 (LGWR switch)
  Current log# 1 seq# 3187 mem# 0: /data/u01/oracle/app/oracle/oradata/orcl/redo01.log
Mon Jun 17 10:01:37 2019
Instance Critical Process (pid: 6, ospid: 16219, MMAN) died unexpectedly
Mon Jun 17 10:01:46 2019
System state dump requested by (instance=1, osid=16209 (PMON)), summary=[abnormal instance termination].
System State dumped to trace file /data/u01/oracle/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_diag_16223_20190617100147.trc
Mon Jun 17 10:01:47 2019
PMON (ospid: 16209): terminating the instance due to error 822
Mon Jun 17 10:01:47 2019
opiodr aborting process unknown ospid (16621) as a result of ORA-1092
Mon Jun 17 10:01:53 2019
Instance terminated by PMON, pid = 16209
Mon Jun 17 10:35:12 2019
Starting ORACLE instance (normal) (OS id: 17499)
Mon Jun 17 10:35:12 2019
CLI notifier numLatches:7 maxDescs:1016
Mon Jun 17 10:35:12 2019

排查后发现是 os 执行了 oom killer,这也就不难理解了.

Jun 17 10:01:34 node1 kernel: [7859426.330635] ora_pmon_orcl invoked oom-killer: gfp_mask=0x24201ca, order=0, oom_score_adj=0
Jun 17 10:01:34 node1 kernel: [7859426.330638] ora_pmon_orcl cpuset=/ mems_allowed=0