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DFSFXC10

Module DFSFXC10 performs the locking and deadlock detection for IMS Program Isolation (PI). PI is the function of IMS that allows multiple regions to update the same database at the same time.

The manual IMS Program Isolation Locking, GG66-3193, gives an excellent description of all the details of this process.

Hints

IMS program isolation locking is extremely efficient. DFSFXC10 should not be a performance consideration. The IRLM lock manager is less efficient than program isolation locking in terms of storage used, CPU used, lock granularity, and deadlock detection. The IRLM should not be used for IMS local locking.

Reference Sources

IMS Program Isolation Locking G66-3193.

More information is available in the IMS DBSOURCE Library Data Set. See your IMS systems programmer.