Management of Cached "LOCATE RECORD" Domains
Original Publication Date: 1985-Sep-01
Included in the Prior Art Database: 2005-Feb-19
In a cached data storage system, count key data and extended count key data architecture coexist, making it necessary to determine when a LOCATE RECORD domain has expired. This determination includes counting the number of records processed and examination of chaining. Examples are provided. A microcode counter for counting the number of records processed through the cache, plus a flag for indicating in the microcode chaining from a READ COUNT or READ COUNT MULTITRACK, are employed. The counter is decremented from its LOCATE RECORD initialized count by the decoding of each of the peripheral commands READ HA (MT), READ R0 (MT), READ CKD (MT) and READ COUNT (MT).