Unable to access or rename a data set - contention with CAMIMGR
Article ID: 101873
Updated On:
Products
Issue/Introduction
We are unable to rename a dataset which says it is in contention with CAMIMGR (MII). How can we free (release) this dataset, and possibly other datasets from contention with CAMIMGR?
We have job trying to access a dataset that shows contention with MIM. Why is MIM holding the dataset?
Environment
Release: 12.5
Component: MII
Cause
When a user address space on an external system owns a global ENQ, and the local system is waiting, GRS shows CAMIMGR as the owner of the ENQ. This scenario is referred to as a "MIM-blocking ENQ".
When you see contention with your MIM STC on the same LPAR where you are attempting to access or update a file, it is not a conflict with MIM as such; MIM is holding a local ENQ to prevent changes due to contention with a different system.
Resolution
Use the DISPLAY ENQRESOURCE command to determine who is holding the dataset to be renamed.
F MIM,D ENQR=(qname,dsname)
If you are not sure of the qname needed, you can issue the following command:
F MIM,DISPLAY CONFLICTS
* The D ENQR command may need to be entered on multiple systems to find the true non-MIM owner.
Example:
F MIM,D ENQR=(SYSDSN,SYSTEM.PROD.LOAD)
MIM0067I Command DISPLAY 211
MIM1091I GDIF ENQRESOURCE DISPLAY
QNAME RNAME Requestor Type
SYSDSN SYSTEM.PROD.LOAD S=PRD1 HOLDS SHR
S=TST1 HOLDS SHR
The display results show that two different users on system PRD1 and TST1 own the enqueue which is preventing the rename.
The command needs to be entered again on PRD1 and TST1 to find the true owner.
Additional Information
Feedback
