ORA-00445: background process W000 did not start after 120 seconds导致数据库死机

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问题描述:
在数据库运行过程中发现两次 smon 进程僵死导致的数据库down机。 在这个时候, 连接数 一次为400,一次为141. 出现这样的情况的时候, sqlplus /nolog 然后 conn / as sysdba 无响应。
数据库服务器配置为 linux redhat 64位 内存 32g , oracle 为11203. sga分配12g。大家帮忙看看错误原因。
alert中的描述如下
======================7-10================================
Thu Jul 10 14:02:36 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_smco_34722.trc (incident=537285):
ORA-00445: background process "W009" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_537285/app_smco_34722_i537285.trc
Dumping diagnostic data in directory=[cdmp_20140710140240], requested by (instance=1, osid=34722 (SMCO)), summary=[incident=537285].
Thu Jul 10 14:02:42 2014
Thu Jul 10 14:03:36 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:04:36 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:06:07 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:07:07 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:07:13 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_smco_34722.trc (incident=537286):
ORA-00445: background process "W004" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_537286/app_smco_34722_i537286.trc
Thu Jul 10 14:08:38 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:09:18 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_smco_34722.trc (incident=537287):
ORA-00445: background process "W005" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_537287/app_smco_34722_i537287.trc
Thu Jul 10 14:09:39 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:11:09 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:11:38 2014
Thu Jul 10 14:12:09 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:13:40 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:14:40 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:16:11 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:17:11 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:18:42 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:19:28 2014
Thu Jul 10 14:19:43 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:21:14 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:22:14 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:23:45 2014
PMON failed to acquire latch, see PMON dump
Thu Jul 10 14:28:35 2014
============================================================
========================8-4====================================
Sun Aug 03 23:03:42 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_smco_5482.trc (incident=681013):
ORA-00445: background process "W000" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_681013/app_smco_5482_i681013.trc
Sun Aug 03 23:03:44 2014
Dumping diagnostic data in directory=[cdmp_20140803230344], requested by (instance=1, osid=5482 (SMCO)), summary=[incident=681013].
Sun Aug 03 23:07:32 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_smco_5482.trc (incident=681014):
ORA-00445: background process "W002" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_681014/app_smco_5482_i681014.trc
Sun Aug 03 23:21:07 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681197):
ORA-00445: background process "q002" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_681197/app_qmnc_5253_i681197.trc
Sun Aug 03 23:23:20 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681198):
ORA-00445: background process "q002" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_681198/app_qmnc_5253_i681198.trc
Sun Aug 03 23:25:32 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681199):
ORA-00445: background process "q002" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_681199/app_qmnc_5253_i681199.trc
Sun Aug 03 23:27:44 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681200):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:29:55 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681201):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:32:06 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681202):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:34:17 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681203):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:36:28 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=681204):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:38:39 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704837):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:40:50 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704838):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:43:01 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704839):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:45:12 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704840):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:47:23 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704841):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:49:35 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704842):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:51:46 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704843):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:53:57 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704844):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:56:08 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704845):
ORA-00445: background process "q002" did not start after 120 seconds
Sun Aug 03 23:58:19 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704846):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:00:30 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704847):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:02:41 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704848):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:04:52 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704849):
ORA-00445: background process "q002" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_704849/app_qmnc_5253_i704849.trc
Mon Aug 04 00:07:04 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704850):
ORA-00445: background process "q002" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_704850/app_qmnc_5253_i704850.trc
Mon Aug 04 00:09:16 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704851):
ORA-00445: background process "q002" did not start after 120 seconds
Incident details in: /oracle/diag/rdbms/app/app/incident/incdir_704851/app_qmnc_5253_i704851.trc
Mon Aug 04 00:11:28 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704852):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:13:40 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704853):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:15:51 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704854):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:18:02 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704855):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:20:13 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704856):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:22:24 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704857):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:23:23 2014
PMON failed to acquire latch, see PMON dump
Mon Aug 04 00:24:23 2014
PMON failed to acquire latch, see PMON dump
Mon Aug 04 00:24:35 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704858):
ORA-00445: background process "q002" did not start after 120 seconds
Mon Aug 04 00:25:53 2014
PMON failed to acquire latch, see PMON dump
Mon Aug 04 00:26:46 2014
Errors in file /oracle/diag/rdbms/app/app/trace/app_qmnc_5253.trc (incident=704859):
ORA-00445: background process "q003" did not start after 120 seconds
Mon Aug 04 00:26:53 2014
PMON failed to acquire latch, see PMON dump
Mon Aug 04 00:28:23 2014
PMON failed to acquire latch, see PMON dump
Mon Aug 04 00:29:23 2014
PMON failed to acquire latch, see PMON dump
Mon Aug 04 00:30:53 2014
PMON failed to acquire latch, see PMON dump
...全文

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