Term Definition Term Definition
Batch Running in the background with no user assistance LRECL Logical Record Length
CICS® Customer Information Control System; online transaction processing program; running in the foreground communicating with users LSR Local Shared Resources
CPU Central Processing Unit; contains the logic functionality and processes the instructions that drive a computer. Mainframe Large processors or servers
DCB Data Control Block parameter of DD statement in JCL MIPS Million Instructions Per Second
DD Data Definition statement in JCL MSU Measured Service Units
EXCP Execute Channel Program MVS™ Multiple Virtual Storage; mainframe operating system
Hiperspace™ A virtual storage area (up to 2gigabytes in size) outside the user's virtual address space residing in real or expanded storage and backed up by auxiliary storage OS/390® Mainframe operating system (was MVS)
(old name - now referred to as z/OS®)
I/O Input and Output Systems Z Line of IBM® computer systems running operating systems such as z/OS
LE IBM Language Environment® VIO Virtual Input/Output
LNKLST Link List XPLINK eXtra Performance Linkage;
An IBM performance optimization technique using new linkage conventions
LPA Link Pack Area z/OS Mainframe operating system
RECFM Record Format used in DCB parameter of DD statement in JCL