V

valid response

In CA ADS, a global or local response that is defined as valid for a particular application function. More than one response can be valid for a single function.

validate

In system generation, the process used to verify and cross-reference relationships among all components of the system definition.

VALIDATE utility statement

The utility that checks referential constraints for a referencing table, making sure that referenced rows exist and contain the appropriate column values.

value

In logical database design, a single occurrence of an attribute.

variable dialog block (VDB)

In CA ADS, a nonreentrant table used by the runtime system to obtain user-specified information about a particular dialog. The VDB is dynamically created for each dialog when the dialog is initiated. It resides in the storage pool and contains header information, the map request block (MRB) for the dialog (if any), and a variable record element (VRE) for each record used in the dialog.

variable field

In the Mapping Facility, any map field whose value can be changed during map execution. The following types of fields are variable: data fields, message fields, page fields, and response fields.

variable record element (VRE)

In CA ADS, a control block that contains variable runtime information on a record used in a dialog. One VRE is established for each record in a dialog. Internally, CA IDMS/DB also treats fixed-length compressed records as variable-length records.

variable-length record

In CA IDMS/DB, a record whose length depends on a variable field (that is, a record defined with an OCCURS DEPENDING ON clause).

VDB

See variable dialog block (VDB).

VECT

The DC/UCF symbol used to designate the debugger's vector table.

VIA location mode

The location mode that clusters member records in the same physical location for efficient database access. Optionally, VIA can cluster member records with their owners.

VIA overflow

See overflow.

view

1) A table that is not physically stored in the database but instead derives data from one or more other tables each time the view is requested. 2) A subset of a record definition that, through the subschema, restricts the elements of the record that a given program can access. A subschema view for a record is defined through the DDDL or subschema compiler. See also table, base table, updatable view.

Visual DBA

See CA IDMS Visual DBA.

VM/ESA option

In CA IDMS/DB installations, an option that allows a DC/UCF system to run in a VM/ESA virtual machine. The VM/ESA option also makes communication possible from one virtual machine to another in a VM/ESA environment.

Vnnnn

The generic term for the ddname or linkname of a test load library. Nnnn indicates the DC/UCF test version under which load modules from this library are used. For example, if a user specifies DCUF TEST 6, DC/UCF searches V0006 before searching the current loadlist. Test load libraries are available under z/OS, z/VM and VM/ESA, and BS2000/OSD.

VRE

See variable record element (VRE).