闲着无聊，看历史的alert文件，发现kkjcre1p: unable to spawn jobq slave process, error 1089警告

Thu Jul  8 21:23:39 2010
Starting background process CJQ0
CJQ0 started with pid=18, OS id=9019
Thu Jul  8 21:23:39 2010
Shutting down instance: further logons disabled
Thu Jul  8 21:23:42 2010
kkjcre1p: unable to spawn jobq slave process, error 1089
………………
Thu Jul  8 21:23:57 2010
kkjcre1p: unable to spawn jobq slave process, error 1089
Thu Jul  8 21:23:59 2010
Stopping background process QMNC
Thu Jul  8 21:23:59 2010
Stopping background process CJQ0
Thu Jul  8 21:24:01 2010
Stopping background process MMNL
Thu Jul  8 21:24:02 2010
Stopping background process MMON
Thu Jul  8 21:24:03 2010
Shutting down instance (immediate)
License high water mark = 1
Waiting for dispatcher 'D000' to shutdown
All dispatchers and shared servers shutdown
Thu Jul  8 21:24:05 2010
ALTER DATABASE CLOSE NORMAL
Thu Jul  8 21:24:05 2010
SMON: disabling tx recovery
SMON: disabling cache recovery
Thu Jul  8 21:24:05 2010
Shutting down archive processes
Archiving is disabled
Archive process shutdown avoided: 0 active
Thread 1 closed at log sequence 2
Successful close of redo thread 1
Thu Jul  8 21:24:05 2010
Completed: ALTER DATABASE CLOSE NORMAL
Thu Jul  8 21:24:05 2010
ALTER DATABASE DISMOUNT
Completed: ALTER DATABASE DISMOUNT
ARCH: Archival disabled due to shutdown: 1089
Shutting down archive processes
Archiving is disabled
Archive process shutdown avoided: 0 active
ARCH: Archival disabled due to shutdown: 1089
Shutting down archive processes
Archiving is disabled
Archive process shutdown avoided: 0 active

警告原因
If a job is about to be spawned when shutdown of database is in progress, you will see these errors in the alert log file and this is perfectly valid.

解决方法
1、这个警告可以安全的忽略
There is no harm at all because of this warning being logged to the alert.log The Error can be safely ignored as the job coordinator process tried to spawn a job slave when the Shutdown was in progress.

2、设置_JOB_QUEUE_INTERVAL更大值，减少出现该警告概率
One workaround that we can suggest is to set an underscore parameter
_JOB_QUEUE_INTERVAL=120 or greater value
The default value is 60 but when we change to 120 there are less chances of getting the above warnings in the alert log file.
Kkjcre1p: Unable To Spawn Jobq Slave Process, Error 1089 [ID 344275.1]