user-defined data type (UDT)
See distinct type.
user-defined function (UDF)
A function that is defined to DB2 by
using the CREATE FUNCTION statement
and that can be referenced thereafter in
SQL statements. A user-defined function
can be an external function, a sourced
function, or an SQL function. Contrast
with built-in function.
user view
In logical data modeling, a model or
representation of critical information that
the business requires.
UTF-16
Unicode Transformation Format, 16-bit
encoding form, which is designed to
provide code values for over a million
characters and a superset of UCS-2. The
CCSID value for data in UTF-16 format is
1200. DB2 for z/OS supports UTF-16 in
graphic data fields.
UTF-8 Unicode Transformation Format, 8-bit
encoding form, which is designed for ease
of use with existing ASCII-based systems.
The CCSID value for data in UTF-8
format is 1208. DB2 for z/OS supports
UTF-8 in mixed data fields.
value The smallest unit of data that is
manipulated in SQL.
variable
A data element that specifies a value that
can be changed. A COBOL elementary
data item is an example of a host
variable. Contrast with constant.
variant function
See nondeterministic function.
varying-length string
A character, graphic, or binary string
whose length varies within set limits.
Contrast with fixed-length string.
version
A member of a set of similar programs,
DBRMs, packages, or LOBs.
v A version of a program is the source
code that is produced by precompiling
the program. The program version is
identified by the program name and a
timestamp (consistency token).
v A version of an SQL procedural
language routine is produced by
issuing the CREATE or ALTER
PROCEDURE statement for a native
SQL procedure.
v A version of a DBRM is the DBRM
that is produced by precompiling a
program. The DBRM version is
identified by the same program name
and timestamp as a corresponding
program version.
v A version of an application package is
the result of binding a DBRM within a
particular database system. The
application package version is
identified by the same program name
and consistency token as the DBRM.
v A version of a LOB is a copy of a LOB
value at a point in time. The version
number for a LOB is stored in the
auxiliary index entry for the LOB.
v A version of a record is a copy of the
record at a point in time.
view A logical table that consists of data that is
generated by a query. A view can be
based on one or more underlying base
tables or views, and the data in a view is
determined by a SELECT statement that is
run on the underlying base tables or
views.
Virtual Storage Access Method (VSAM)
An access method for direct or sequential
processing of fixed- and varying-length
records on disk devices.
Virtual Telecommunications Access Method
(VTAM)
An IBM licensed program that controls
communication and the flow of data in an
SNA network (in z/OS).
volatile table
A table for which SQL operations choose
index access whenever possible.
VSAM
See Virtual Storage Access Method.
VTAM
See Virtual Telecommunications Access
Method.
warm start
The normal DB2 restart process, which
involves reading and processing log
records so that data that is under the
control of DB2 is consistent. Contrast with
cold start.
556 Application Programming Guide and Reference for Java
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