ORA-01012: not logged on

I am getting the below error. I couln't find any thing in the log and trace files.

ORA-01012: not logged on

Please advice.
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slightwv (䄆 Netminder) Commented:
You have either not logged in or something closed your connection.

What application/program/??? is generating that error?
slightwv (䄆 Netminder) Commented:
Have you checked the description for that error:
dba1234Author Commented:
I am trying to login on sqlplus "/as sysdba"
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slightwv (䄆 Netminder) Commented:
Is the databsae started and 'open'?

from the sqlplus prompt type: startup

If it says it is already started try: alter database open;
slightwv (䄆 Netminder) Commented:
I've seen a few posts on other sites that indicate this can also be caused by exceeding the number fo processes.

check the processes spfile parameter.  You might need to increase the value:
dba1234Author Commented:
I tried but getting error.

SQL*Plus: Release - Production on Wed Mar 28 10:48:05 2012

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

SQL> startup
ORA-01081: cannot start already-running ORACLE - shut it down first
SQL> shutdown
ORA-24324: service handle not initialized
ORA-24323: value not allowed
ORA-27140: attach to post/wait facility failed
SQL> shutdown abort
ORA-01031: insufficient privilegesseelct * from v%

and after kiiling some of the processes
now I am stucked

SQL> shutdown abort
ORACLE instance shut down.
SQL> startup
ORA-00445: background process "DBW0" did not start after 120 seconds
slightwv (䄆 Netminder) Commented:
Did I ask you to shutdown?  Why did you attempt to shut down in the first place?

Also, you should never use ABORT unless there is absolutely no other way to shut down.

>>and after kiiling some of the processes

This is worse that a shutdown abort.

To get back, might was well abort again:
shutdown abort;

Then from the OS kill any remaining oracle processes.

Then try to startup.

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slightwv (䄆 Netminder) Commented:
What was the final solution to the problem?

I doubt the accepted answer actually solved the question asked.
slightwv (䄆 Netminder) Commented:
Please return to this question and respond to my question.
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