MAI Installation Exit MAIEX02 › How You Implement the MAI Exit › Exit Serialization › Second-level Serialization

Second-level Serialization

The second level of serialization, MAIEX02S=USER, ensures that calls to the exit are serialized at a user level only. That is, the exit can concurrently process multiple calls for different users, but calls for any one user are serialized. This level protects the User Correlator, ensuring that if set by one call it is presented to the next call for that user correctly. However, it does not protect the System Correlator or any control block structure the exit maintains.

MAIEX02S=USER provides processing overlap advantages over the MAIEX02S=SYSTEM option. If the exit is purely validating or changing session parameters, you can use MAIEX02S=USER with safety.