Library /sys$common/syshlp/SYSMANHELP.HLB  —  Sys Parameters, ACP_MAPCACHE
    ACP_MAPCACHE sets the number of pages for caching index file
    bitmap blocks. Too small a value causes excessive XQP I/O
    operations, while too large a value causes excessive physical
    memory to be consumed by the bitmap cache.

    ACP_MAPCACHE is an AUTOGEN, DYNAMIC, and FEEDBACK parameter.
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