Library /sys$common/syshlp/SYSGEN.HLB  —  Sys Parameters, ACP_HDRCACHE
    ACP_HDRCACHE sets the number of pages for caching file header
    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 file header caches.

    ACP_HDRCACHE is an AUTOGEN, DYNAMIC, and FEEDBACK parameter.
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