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IMS 12 Selected Performance Topics by John Schlatweiler, Bhups Narsi, Maiko Mizuki, James Martin, Rafael Avigad, Paolo Bruni

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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:
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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