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Don Burleson Blog 







  Killing Oracle instance tips

Oracle Database Tips by Donald BurlesonMarch 29, 2015

Question:  My Oracle instance is not accepting SYSDBA connections.  How to go out to my UNIX/Linux OS and kill my Oracle instance?

Answer:  If you cannot connect, you have two choices, eighteen wait (impacting the end users) or immediately bounce the instance.  You kill the instance by:

1 - Killing the background processes and removing the RAM segments.

2 - Connecting to a hung database with the -prelim option to bypass creation of a new SQL*Plus session.

Here is how to kill an Oracle instance:

1 - kill -9 on the PMON and SMON processes,  See kill command.
2 - Verify that all background processes are killed (ps -ef|grep -i ora-")  See note below.

3 - Remove any held RAM with ipcs -pmb.  See ipcs command.

4 - (for non AIX and Windows only) Use the ipcs –sa command to display held semaphores and then use the ipcrm –s command to release the held semaphores for the instance

5 - Restart the instance, and wait to allow rollback of in-flight updates.

It is easy to create a single command to terminate all Oracle processes associated with your hung database instance.  In the example below, we use the ps command to identify the Oracle processes and then use the awk utility to extract the process ID (PID) for the Oracle processes.  We then pipe the process ID into the UNIX kill command:

root> ps -ef|grep $ORACLE_SID| \
      grep -v grep|awk '{print $2}'|xargs -i kill -9 {}  


See these related notes on killing an Oracle instance:

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