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November 29, 2011

DB2 10 Data Sharing Fix Issued

IBM recently released a Red Alert for customers who are using data sharing and DB2 10 for z/OS.
Fortunately we don't see these very often. When they are issued they should be taken very seriously. From the alert:

"IBM has become aware of potential data loss when running data sharing under any mode of DB2 10 for z/OS.

"DB2 10 for z/OS takes advantage of a CFCC/XES performance enhancement by allowing repeated READ CASTOUT CLASS requests to the CF to utilize a restart token and retrieve from the queue where the previous read left off. A defect has been identified in this implementation of the enhanced READ CASTOUT CLASS in DB2 10 for z/OS."

The alert further states that APAR PM51655 should be applied to revert the DB2 10 behavior of the READ CASTOUT CLASS to the DB2 V9 (and prior releases) behavior.

Read more about this Red Alert and the recommended action here.