Glossary of mainframe terms and expressions
Virtual Storage means that each running program can assume it has access to all of the storage defined by the architecture’s addressing scheme. The only limit is the number of bits in a storage address. This ability to use a large number of storage locations is important because a program […]
Conceptually, mainframes and all other computers have two types of physical storage: – The physical storage located on the mainframe processor itself. This is called processor storage or real storage; think of it as memory for the mainframe. – The physical storage external to the mainframe, including storage on direct […]
As instructions execute the work of a computer system, they keep track of this work in storage areas known as control blocks. Generally speaking, there are four types of z/OS control blocks: – System-related control blocks – Resource-related control blocks – Job-related control blocks – Task-related control blocks Each system-related […]
Dynamic Address Translation, or DAT, is the process of translating a virtual address during a storage reference into the corresponding real address. If the virtual address is already in real storage, the DAT process may be accelerated through the use of a translation lookaside buffer; if the virtual address is […]
VSAM applies to both a data set type and the access method used to manage various user data types. VSAM data sets are held on direct access storage devices (DASD) auxiliary storage. VSAM divides its data set storage into control areas (CA), which are further divided into control intervals (CI). […]
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