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Websphere MQ 6 Processes on a Unix platform

On a unix box I issued the following command ps -ef | grep <qmgr> and saw the following process running:

amqzmuc0 - Critical process manager
amqzmur0 - Restartable process manager

I google for the following information but was unable to find anything related to this processes. What is the purpose of this process and how do they differ from each other?
1 Solution
A good summary on MQ processes can be found on page
"An Introduction to WMQ Queue Manager Processes"

It writes:

amqzmur0 and amqzmuc0 are the two processes that are responsible for logging the transaction information into the log files. These are called restartable (mur0) and critical (muc0) processes respectively.

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