ORA-30 Received When Trying To Kill Session

(Doc ID 1011386.6)

Last updated on DECEMBER 06, 2016

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.
***Checked for relevance on 01-Jul-2016***


After issuing ALTER SYSTEM KILL SESSION (sid,serial#);

an ORA-30 may occur.

ORA-00030, 00000, "user session ID does not exist"
// *Cause: The user session id no longer exists, probably because the
// session was logged out.
// *Action: Use a valid session ID.

The command may have been issued for one or more of the following reasons:

1. The process no longer exists at the os level, but does show up as active in


2. The user reboots the client machine without logging off, leaving a shadow


3. That session is holding onto a lock that needs to be released.




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