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Using the ENQ/RESERVE/DEQ monitor tool z/OS MVS Planning: Global Resource Serialization SA23-1389-00 |
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The main objective of the global resource serialization monitor tool is to assist in planning the RNLs for global resource serialization implementation. The tool monitors ENQ, DEQ, and RESERVE requests, and collects data about the resources and the requesters. The objectives of the tool are:
An interactive ISPF application allows viewing and printing of the collected data. Alternatively, the data can be written to a sequential data set. Reports can be generated by modifying the sample procedures provided in SYS1.SAMPLIB. If the data is not written to datasets, it is collected in a dataspace associated with the monitor address space. The amount of data saved in the dataspace can be controlled by the DSP PARM (ses Figure 1). The monitor stops collecting data and issues message ISGAU015 - DATA SPACE FULL when the dataspace is full. Guideline: The monitor's intent is to assist with planning and tuning of RNLs for the implementation of global resource serialization. The monitor uses system resources in order to collect data. IBM® recommends that you do not run the monitor continuously during normal production work. While running the monitor you might observe high CPU in address spaces that issue many ENQ/RESERVE/DEQ requests. This contains the following topics:
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