gtpd3m0yLibrary Guide with Master Index and Glossary

V

valid
In XML, the term used to describe a document that conforms to the rules of the associated schema. See also schema.

validation
A process that checks persistent collection structures to ensure that they are built correctly.

variable cross-reference support (VCRS)
The offline program that scans a partitioned data set and prints a cross-reference listing of the global variable symbols used in the data set, lists the PDS members in which the symbols are used, and lists any other global variables that depend on those members.

VCRS
Variable cross-reference support.

VCT
Virtual file access (VFA) count.

VEQR
Virtual-equals-real.

VEQV
Virtual-equals-virtual.

verb
A conversation statement that transaction programs issue to communicate through the LU 6.2 protocol boundary. The program's current conversation state determines what verbs a transaction program can issue.

vertical allocation
When allocating record space on DASD, logically adjacent records are allocated sequentially to the same physical device. Contrast with horizontal allocation.

VFA
Virtual file access.

VFA candidate
A record held in virtual file access (VFA) that may or may not be synchronized across processors. A record that is synchronized across processors is called a VFA synchronization candidate.

VIPA
Virtual Internet Protocol (IP) address.

virtual address
The address of a location in virtual storage. A virtual address must be translated into a real address to process the data in processor storage. See also absolute address, logical address, physical address, and real address.

virtual-equals-real (VEQR) mode
An operating mode in which system virtual memory (SVM) addresses are equal to ECB virtual memory (EVM) addresses. Virtual-equals-real (VEQR) mode is used to test and debug code that is being migrated to the TPF 4.1 system.

virtual file access (VFA)
A storage management facility that dynamically allocates frequently referenced records to main storage.

virtual file access count (VCT) list
A secondary CPU loop list which contains entries that were forced to give up control after exceeding a system resource threshold, one of which is the number of virtual file access (VFA) record accesses.

virtual IP address (VIPA)
An Internet Protocol (IP) address that is associated with a Transmission Control Protocol/Internet Protocol (TCP/IP) stack without associating with a specific physical network attachment, thereby allowing error recovery if failures occur.

virtual reader
The VM/ESA facility that supplies input to a virtual machine.

Virtual Telecommunications Access Method (VTAM)
An IBM licensed program that controls communication and the flow of data in a computer network. It provides single-domain, multiple-domain, and multiple-network capabilities.

VTAM
IBM Virtual Telecommunications Access Method.