IMS 12 Selected Performance Topics

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Fast Path performance considerations

This chapter explores Fast Path processing. IMS 11 introduced Fast Path 64-bit buffer pools. IMS 12 introduces Fast Path secondary index (FPSI) and Fast Path log reduction.

First, we describe general performance considerations and then proceed to the new functions:

•Fast Path 64-bit buffer manager

This function was introduced in IMS 11 and enhanced in IMS 12. The 64-bit buffer manager creates database buffers above the 2 GB bar, in 64-bit virtual storage. Those buffer pools are pre-expanded in anticipation ...

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