- variable length variable blocked (VLVB)
- Data format of messages
transmitted between CICS and IMS.
- verification
- The act
of confirming that a user is eligible to use a RACF-defined userid.
- view
- (1) In the CICSPlex SM API, a temporary, customized form of a resource table.
A view can consist of some or all of the resource table attributes in any
order.
- (2) In the CICSPlex SM ISPF end-user interface, a formatted
display of selected data about CICS resources or CICSPlex SM definitions.
The data in a view is obtained from a query and can be presented in one or
more forms. The data can be limited to a subset of CICSplex resources or definitions
by establishing a context and scope.
- viewport
- In BMS, the area
of a screen that is allocated to a partition.
- virtual address
- The address of a location in virtual storage. A virtual address
must be translated into a real address in order to process the data in processor
storage.
- virtual address space
- In CICS/VSE, a subdivision of the virtual
address area available to the user for the allocation of private, nonshared
partitions.
- virtual disk
- In CICS/VSE, a range of up to two gigabytes of contiguous
virtual storage addresses that a program can use as workspace. Although the
virtual disk exists in storage, it appears as a real FBA disk device to the
user program. All I/O operations directed to a virtual disk are intercepted
and the data to be written to, or read from, the disk is moved to or from
a data space. Like a data space, a virtual disk can hold only user data; it
does not contain shared areas, system data or programs. Unlike an address
space or a data space, data is not directly addressable on a virtual disk.
To manipulate data on a virtual disk, the program has to perform I/O operations.
- virtual lookaside facility (VLF)
- MVS/ESA facility that manages
the data space associated with library lookaside (LLA).
- virtual machine
(VM)
- A functional simulation of a computer and its associated
devices.
- Virtual Machine/System Product (VM/SP)
- An IBM operating system
that supplies a virtual machine to each logged-on user.
- virtual partition
- In CICS/VSE, a division of the dynamic area of virtual storage.
- virtual storage
- The storage space that can be regarded as addressable
main storage by the user of a computer system in which virtual addresses
are mapped into real addresses. The size of virtual storage is limited by
the addressing scheme of the computer system and by the amount of auxiliary
storage available, not by the actual number of main storage locations. See
also storage, main storage.
- Virtual Storage Access Method (VSAM)
- An access method for direct
or sequential processing of fixed and variable-length records on direct access
devices. The records in a VSAM data set or file can be organized in logical
sequence by a key field (key sequence), in the physical sequence in which
they are written on the data set or file (entry-sequence), or by relative-record
number.
- virtual storage constraint relief (VSCR)
- The movement of areas
of code or control blocks to storage above the 16MB line, or the reduction
of code or control blocks below the 16MB line. These actions increase the
storage available for user programs and data that use 24-bit addressing.
- Virtual Storage Extended (VSE)
- A system that consists of a basic
operating system (VSE/Advanced Functions) and any IBM supplied and user-written
programs required to meet the data processing needs of a user. VSE and the
hardware it controls form a complete computing system. Its current version
is called VSE/ESA.
- virtual storage paging
- A technique
used by CICS in a virtual storage environment. The key objective of programming
in this environment is the reduction of page faults. A page fault occurs when
a program refers to instructions or data that do not reside in real storage,
in which case, the page in virtual storage that contains the referenced instructions
or data must be paged into real storage. The more paging required, the lower
the overall system performance.
- Virtual Telecommunications Access Method (VTAM)
- An IBM licensed
program that controls communication and the flow of data in an SNA network.
It provides single-domain, multiple-domain, and interconnected network capability.
- VLF
- See virtual lookaside facility (VLF).
- VLVB
- See variable length variable blocked (VLVB).
- VM
- See virtual machine.
- VM/SP
- See Virtual Machine/System Product (VM/SP).
- volume switch
- Action taken by CICS to archive a journal data set
when it is full, while continuing to write to a second data set.
- VSAM
- See Virtual Storage Access Method (VSAM).
- VSAM RLS
- VSAM record-level sharing, an access
mode supported by DFSMS to allow multiple applications to share data sets,
with data locking at the record level. Access to data sets is through an SMSVSAM
server. See also SMSVSAM.
- VSAM shared resources
- Buffers and strings shared by several VSAM data files. This is
defined to CICS in the file control table.
- VSAM sphere
- The collection
of all the component data sets associated with a given VSAM base data set
- the base, index, alternate indexes, and alternate index paths.
- VSAM work
area (VSWA)
- An area that is acquired dynamically by the file control
program when accessing a VSAM data set.
- VSCR
- See virtual storage constraint relief (VSCR).
- VSE
- See Virtual Storage Extended (VSE).
- VSE/Data Interfile Transfer, Testing, and Operations Utility (VSE/DITTO)
- In CICS/VSE, an IBM licensed program that provides file-to-file
services for disk, tape, and card devices.
- VSE/DITTO
- See VSE/Data Interfile Transfer, Testing, and Operations Utility (VSE/DITTO).
- VSE/ICCF (VSE/Interactive Computing and Control Facility)
- In CICS/VSE,
an IBM licensed program that serves as interface, on a time-slice basis, to
authorized users of terminals linked to the system's processor.
- VSE image
- In CICS/VSE, a single copy of the VSE operating system. Note that a single
processing environment can support more than one VSE image.
- VSE/Interactive Computing and Control Facility
- See VSE/ICCF (VSE/Interactive Computing and Control Facility).
- VSE/POWER
- An IBM licensed program primarily used to spool input
and output. The networking functions of the program enable a VSE system to
exchange files with or run jobs on another remote processor.
- VSWA
- See VSAM work area (VSWA).
- VTAM
- See Virtual Telecommunications Access Method (VTAM).
- VTAM exit trace
- A CICS exit driven by VTAM to return control after
servicing a request issued by CICS. Every such exit contains a trace point.
This provides a way of tracing VTAM requests made from CICS.
- VTAM Performance Analysis and Reporting System (VTAMPARS)
- An IBM
licensed program that provides information on network traffic through the
VTAM component of the network.
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