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Don Burleson Blog 







Oracle zombie process Tips

Oracle Database Tips by Burleson Consulting

January 10, 2015

Question I'm looking for a way to kill dead zombie process (those where the user has alt+ctrl_del then and not ended normally (besides the parameter in the sqlnet
which doesn't seems to do the work (SQLNET.EXPIRE_TIME = 10).

Answer.  A zombie process in Oracle is ma process that appears on the OS but is defunct to Oracle because the connections between Oracle and the OS was disconnected.  There are several ways to kill a zombie process from the operating system.

Killing session with Oracle can be a challenge and different procedures exist within Windows and UNIX. Here are the steps that I use to kill an Oracle session:

1 - Gather zombie session information from Oracle

2 - Kill the zombie at the OS-level

3 - Kill the session within Oracle using the "alter system kill session" command:

a) UNIX - I always locate the Server PID (SPID) from v$process and issue the UNIX

kill -9 command.

The Windows command to kill this session would be as follows.

c:\oracle9i\bin>orakill ORCL92 768

One methods for zombie identification is to  use the ps command to identify idle processes:

root> ps aux | awk '{ print $8 " " $2 }' | grep -w Z

See my notes on killing dead zombie processes from the server side.

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