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Trouble shoot ORA-01012: not logged on

edited Aug 28, 2013 12:14AM in Database Administration (MOSC) 9 commentsAnswered
Hi,

The problem started as follows
The users were experiencing slow performance.identifying   a long running query (> 10 mins.). The processes for that query were killed.
Once that happened the users were getting ORA-01012: not logged on

The SQL database operation failed. : ORA-01012: not logged on
Process ID: 3437
Session ID: 762 Serial number: 381

Research:

According to Oracle 10g R2 Administrator's Guide you get ORA-01012 for every attempt to submit a request to the database after receiving an ORA-00028 (your session has been killed) message:

http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14231/manproc.htm#sthref705

Are there any errors that precede the ORA-01012 message.

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