Data Set JOIN Accomplished Using I/O Controller Disk Cache Facilities
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
A technique is described whereby a disk cache buffer and input/output (I/O) controller facilities are used to save central processing time by creating new data sets, based on logical relationships defined among two or more existing data sets. The concept uses relational data base and file JOIN techniques within the disk subsystem formed by the disk unit and its I/O controller. In information management systems, more and more emphasis is given to the creation of special data sets to meet the individual needs of a user. Data base changes are in the form of additions to existing support. Multiple and special purpose data sets have become more evident since the installation of executive work stations. Usually, a great deal of processing time is required to create special customized data sets.