The data set ENQ contention monitor is a sample application that determines which data sets are experiencing contention from multiple jobs. The data set ENQ contention monitor, which runs as a started task, periodically examines the data returned by the GQSCAN macro to locate data set contention. If a TSO/E user is the sole owner of a data set that other jobs are waiting to use, the TSO/E user receives a message asking the user to free the data set.

The data set ENQ contention monitor works only for TSO/E users that hold resources on the system where it is started. Therefore, you might want to start the data set ENQ contention monitor on each system in a global resource serialization complex. The data set ENQ contention monitor can detect contention for both local and global resources.