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MVS inherited three main types from its predecessors: Sequential data sets were normally read one record at a time from beginning to end. In BDAM (direct access) data sets, the application program had to specify the physical location of the data it wanted to access (usually by specifying the offset from the start of the data set).
VM/XA MA is intended to ease the migration from MVS/370 to MVS/XA by allowing both to run concurrently on the same processor complex. [8] Virtual Machine/Extended Architecture System Facility VM/XA SF is an upgraded VM/XA MA with improved functionality and performance. [9] Virtual Machine/Extended Architecture System Product
However, a CICS address space, due to its quasi-reentrant application programming model, could not exploit more than about 1.5 processors on one box at the time – even with use of MVS sub-tasks. Without enhanced parallelism, customers would tend to move to IBM's competitors rather than use Sysplex as they scaled up the CICS workloads.
The application program proceeded to execute normal machine code instructions right up to its first macro level API call, thus adding zero overhead to the program until that point. As soon as the API call left the application program, Command-CICS code would gain control and replace the original linkage with its own, equivalent, Command-level call.
TSO/E is a base element of z/OS. Before z/OS, TSO Extensions (TSO/E) was an element of OS/390 and was a licensed program for the MVS and MVS/ESA System Products. [4] Since all z/OS installations usually have both TSO and TSO/E functions installed, it is normal to refer to both TSO and TSO/E as "TSO".
The IBM Information Management System (IMS) is a joint hierarchical database and information management system that supports transaction processing. [1] Development began in 1966 to keep track of the bill of materials for the Saturn V rocket of the Apollo program, and the first version on the IBM System/360 Model 65 was completed in 1967 as ICS/DL/I and officially installed in August 1968.