event id 12 all process in instance stopped orcl

Why tns listener error comes too often and database server connectivity lost ?
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Geert GOracle dbaCommented:
if the database is down, then that will happen

you need to provide a lot more information for an accurate answer
aibadAuthor Commented:
ORACLE 10 g database is running on Hyper-V VM. I can only find error logged in windows event viewer which is attached. FYI VM remain on network during this time I can access it directly or through remote desktop connection. All I have to do mount databases every time.
Hope you better understand my question now.
slightwv (䄆 Netminder) Commented:
If the issue is with the listener, look in the listener.log file.
If the issue is with the database, look in the alert log for the database.

Your DBA should be able to assist you with this.

For the default locations go to where the Oracle software is installed.  You should find a diag folder.

Under that there are two folders: rdbms and tnslsnr.

Move down through the database/instance folder.  Eventually you should see a trace folder.

Look for listener.log.  

For the database there should be a file a alert_instance.log where the word instance is the instance name of the database.

If you want to upload the files, please make sure they do not contain sensitive information.

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Geert GOracle dbaCommented:
well, no, i still have no clue where your problem is
aibadAuthor Commented:
the issue is with listener, thanks its resolved now
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