Abstract
A set of programs are described defining an interface between an online information system and the Input/ Output Control System of the computer system. These programs are grouped by the function they perform: buffering, item relocation, compression, and dynamic priority assignment. The interface is adaptive in nature by physically reorganizing the data set based on usage statistics. Items are physically assigned to priority areas to reduce system I/O. The result of the reorganization is to construct working set data sets, a subset of the original data set, having a substantial portion of all data set activity. This working set data set is maintained in core via buffering, thereby reducing I/O overhead. In order to implement the interface and reduce the cost of storing data sets, one of the many available compression routines was applied to the entire data base.
Dance, Dennis Lee (1973). An online data compression system. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -188824.