IMS 12 Selected Performance Topics

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Platform-related performance functions

In this chapter, we provide information about IMS performance-related items. We explore IMS 12 enhancements to several IMS system parameters, which can directly affect performance.

This chapter contains the following topics:

•Dynamic full-function buffer pools

•Increased VSAM pools

•Logging enhancements

•Disk technology on log performance

•WADS redesign

•System pools in 64-bit real storage

•64-bit ACB processing

•zAAP or zIIP times in dependent region accounting log records

•IMS use of zIIP

•Member online ...

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