Dealing with EMNO

Hello,
There is this EMNO process that is getting spawned automatically by Oracle evryevening that brings the database down.
Following is from alert log:

Starting background process EMN0
EMN0 started with pid=146, OS id=3058
Thu Jul 13 16:31:28 2006
Shutting down instance: further logons disabled
Thu Jul 13 16:31:29 2006
Stopping background process MMNL
Thu Jul 13 16:31:29 2006
Stopping background process CJQ0
Thu Jul 13 16:31:30 2006
Stopping background process MMON
Thu Jul 13 16:31:31 2006
Shutting down instance (immediate)
License high water mark = 133
Thu Jul 13 16:31:31 2006
Stopping Job queue slave processes
Thu Jul 13 16:31:31 2006
Job queue slave processes stopped
All dispatchers and shared servers shutdown
Thu Jul 13 16:31:37 2006
ALTER DATABASE CLOSE NORMAL

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Does anyone know how can I stop this process?I've looked on the internet, found people having a similar question, but no concrete answer.Thanks.

well the alert log you posted there shows nothing useful.

You could have searched on metalink and found that emn0 is advanced queueing, if you arent using is you can ignore the message note 105067.1