CICS logging and journaling: Performance and tuning
Individual CICS® log streams can use either coupling facility log structures or the CICS log-manager-supported DASD-only option of the MVS™ system logger. You can tune the performance of the log manager in a number of ways.
For more information about the types of storage used by CICS log streams, see Defining the logger environment for CICS.
For information about how you can define each log stream (based on its usage) when you use coupling facility log structures, see Coupling facility or DASD-only?. For information about the relative performance of coupling facility and DASD-only log streams, see Logging.
If you use a coupling facility, you can use a standalone model. Alternatively, you can use the integrated coupling migration facility (ICMF) to provide the services of a coupling facility in a logical partition (LPAR). This means that the coupling facility and MVS are not failure-independent, thereby requiring the use of staging data sets.
- The IBM® Redbooks® publication Systems Programmer's Guide to: z/OS® System Logger, SG24-6898. This document provides a thorough explanation of the z/OS System Logger, and explains how it should be set up for optimum performance with CICS and other exploiters.
- The IBM Redpaper Performance Considerations and Measurements for CICS and System Logger, REDP-3768. This document, which was written in support of the Redbook publications, supplies additional guidance on the interactions between CICS and z/OS System Logger, provides examples of different CICS and System Logger configurations, and demonstrates the tuning process.
- The IBM support document Useful CICS Logger information. This document provides links to two presentations dealing with performance evaluation and troubleshooting for CICS and z/OS System Logger.
- Defining a couple data set for system logger in z/OS Management Facility Configuration Guide.
- Examples of using the IXCMIAPU utility in z/OS MVS Setting Up a Sysplex.