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 —  Operations  —

ASSOCACHE : Associator Controller Caching

This parameter applies to the operating systems OS/390, z/OS, VM/ESA, and z/VM only.

Parameter Specify . . . Possible Values Default
ASSOCACHE whether to enable (YES) or disable (NO) controller caching for the Associator (ASSO) dataset. YES | NO YES
Value Meaning
YES The default setting. ASSO blocks are preread and maintained as long as possible in the caching facilities of the disk controller.
NO ASSO blocks are not preread.

Notes:

  1. If ASSO blocks are highly scattered or the update frequency is low, controller caching can cause longer I/O response times.
  2. ADARUN caching control parameters also exist for Data Storage (DATACACHE), the work area (WORKCACHE), the sort area (SORTCACHE), and the temp area (TEMPCACHE).

Example:

Run the nucleus without controller caching for the ASSO dataset.

ADARUN PROG=ADANUC,ASSOCACHE=NO

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