Responsive Systems Company

Client Case Study.....2

Client Case Study.....2

  • New Pool Usage
    • BP0 1000 Buffers Catalog & Directory
    • BP1 5000 Buffers Small-Med. Random Indexes
    • BP2 4000 Buffers Small-Med. TS, Mostly Random, Good Hit%
    • BP3 5000 Buffers Sort/Work
    • BP4 2000 Buffers Small-Med. TS, Scanned & Transient
    • BP5 4000 Buffers Large Indexes, Some Scanning
    • BP6 2000 Buffers Large TS, Random & Transient
    • Total of 23,000 Buffers....92 Megabytes Increase of 12 Megabytes
    • VPSEQT set at 25% for all Pools Except BP3, set at 95%
    • Environment Constrained by Available Memory

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Notes:

The revised buffer pool structure after moving objects and sizing. This used an additional 12 Meg of memory - that all the installation could afford without driving MVS paging too high.

The VPSEQT was set at 25% in almost all the pools to keep the randomly access pages in longer. BP3, for the sort/work objects has this set to 95%. While IBM recommends 100%, 95% is a better threshold since there are almost always some noticeable amount of synchronous read/random access activity.