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Subsystem and Transaction Monitoring and Tuning with DB2 11 for z/OS by Yasuhiro Ohmori, Cathy Drummond, Adrian Burke, Felipe Bortoletto, Paolo Bruni

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IRLM, locking, and latching
Locks and latches are used respectively by the application and by DB2 to serialize events and maintain data integrity. The IRLM subsystem manages DB2 locks. You can monitor the use of locks and latches to improve concurrency and prevent problems such as contention, suspensions, timeouts, or deadlocks.
This chapter contains the following topics:
8.1 DB2 ...

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