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Does ACF2 database Cache Facilityhave any affect on updates written to primary databases?


Article ID: 239307


Updated On:


ACF2 - z/OS


With DATABASE CACHE=ENABLED will changes made to the LID, RULE, RESOURCE, Infostorage databases be written to the primary ACF2 databases immediately? Does database cache have any affect on updates written to primary databases?



Release : 16.0

Component : ACF2 for z/OS


The ACF2 Cache Facility does facilitate the processing of read and write requests. With the ACF2 Cache Facility CACHE facility, I/Os are processed concurrently, there is no waiting for write requests, there is no database ENQ by the requestor (user signing on), there is one subtask for each database, there are no SVC interrupts, the records are updated in the cache, inserts, updates, and deletes are passed to the ACFCCMGR subtask for the database update, the ACFCCMGR subtask for the database is processed asynchronously. The CACHE facility would reduce the contention and eliminate the I/O to the logonid database by the user signing on and move the I/O to the  ACFCCMGR subtask thus improving the performance of signons.