If you have packages and still want to use dynamic plan switching techniques

For dynamic plan switching users, if the value of a modifiable special register (for example, the CURRENT PACKAGESET register) is changed during processing and not reset to the initial state before the SYNCPOINT is taken, the following occur:

• The thread is not released by the CICS Db2® attachment facility.
• Thread reuse does not occur because the task continues to use this thread with the same plan allocated.
• Dynamic plan switching does not occur because the same thread and plan are used; that is, the dynamic plan switching exit is not taken on the first SQL statement issued following the SYNCPOINT.