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ACP_EXTCACHE

   ACP_EXTCACHE sets the number of entries in the extent cache.
   Each entry points to one contiguous area of free space on disk.
   A specification of 0 means no cache. Too small a value causes
   excessive XQP I/O operations, while too large a value causes
   excessive physical memory to be consumed by the extent cache.

   ACP_EXTCACHE is a DYNAMIC and FEEDBACK parameter.