VSAM KSDS tuning.(Virtual Storage Access Method; Key Sequenced Data Set)

Enterprise Systems Journal,  June, 1995  by Ferguson, Ronald K.

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There are some myths about Virtual Storage Access Method (VSAM) performance that have been around since its introduction. A common belief is that reorganizing a VSAM Key Sequenced Data Set (KSDS) to rid it of completed CI and CA splits will improve performance and reclaim DASD space. This belief is the reason for many reorganizations, but the reorganizations themselves often do not improve performance.

It is not true that after a split is completed there is performance loss. In fact, the performance penalty is paid completely at the time of the split. After it has been completed, there is no ...

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