DATACOM Multi-User startup fails with error message DB00242E - REQUIRED ENQ NOT AVAILABLE

Document ID : KB000022684
Last Modified Date : 14/02/2018
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Issue : 

 My Datacom Multi-User startup fails with error messages

   DB00242E - REQUIRED ENQ NOT AVAILABLE   
   DB00205E - MULTI-USER ERROR - 0004 MUFNAME=xxxxxxx  

What does this mean and how to correct?

Cause: 

The error message DB00242E REQUIRED ENQ NOT AVAILABLE, MUFNAME=xxxxxxx indicates that the Multi-User may not enable (start up) because another
Multi-User is currently executing with the same identity.

Resolution:

Same identity means same MUF logical name.

This is the name as coded in Multi-User startup SYSIN  card MUF or the MUFNAME as coded in DBSIDPR TARGET_MUF_LIST=(mufname)  . 
In order to be able to enable the Multi-User, wait until the current Multi-User has been shut down or start the Multi-User using a different unique MUF logical name.