Logging and journaling: performance considerations

This section discusses performance tuning issues related to logging and journaling:

The CICS® log manager supports the DASD-only option of the MVS™ system logger. This means that individual CICS log streams can use either coupling facility log structures or DASD-only logging. (For more information about the types of storage used by CICS log streams, see the CICS Transaction Server for z/OS® Installation Guide.)

If you have a coupling facility, the CICS Transaction Server for z/OS Installation Guide contains advice on how you could define each log stream, based on its usage. For information about the relative performance of coupling facility and DASD-only log streams, see Table 261.

If you use a coupling facility, you can use a stand-alone model, such as the S/390® 9674. Alternatively, you can use the integrated coupling migration facility (ICMF) to provide the services of a coupling facility in an LPAR. This means that the coupling facility and MVS are not failure-independent, thereby requiring the use of staging data sets.

Start of changeFor additional advice and examples relating to performance and tuning for logging, you are recommended to consult the following documents:

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