venkata s  s sharma AradhyulaSr. system administratorAsked:
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slightwv (䄆 Netminder) Commented:
Log into the physical server.  Go to Windows Services and stop and start the OracleServiceORCL service.

If that fails to startup the instance, check the alert log for the reasons.

I forget the exact path in Windows but somewhere under D:\app\Administrator there should be a diag/rdbms/ORCL/ORCL/trace folder

In there look for a file alertORCL.log.  Go to the end and look for errors.
Mark GeerlingsDatabase AdministratorCommented:
If you can't easily find the alertORCL.log file, check for any physical problems in the server, including:
1. failed disk drive
2. network interface problems
3. disk full
4. storage system (NAS, SAN, etc.) problems.

Figure out where the alert*.log file is for your database.  Whenever something goes wrong in Oracle, you should check that first.  It will usually contain the actual error, or a clue to the problem (unless the disk this file is on fails or gets full, or if the connection to this disk is not working)

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