IBM DB2 Manual page 542

distributed data facility (DDF)
A set of DB2 components through which
DB2 communicates with another
relational database management system.
Distributed Relational Database Architecture
(DRDA)
A connection protocol for distributed
relational database processing that is used
by IBM relational database products.
DRDA includes protocols for
communication between an application
and a remote relational database
management system, and for
communication between relational
database management systems. See also
DRDA access.
DNS See domain name server.
DOCID
|
| See document ID.
| document ID
A value that uniquely identifies a row
|
that contains an XML column. This value
|
| is stored with the row and never changes.
domain
The set of valid values for an attribute.
domain name
The name by which TCP/IP applications
refer to a TCP/IP host within a TCP/IP
network.
domain name server (DNS)
A special TCP/IP network server that
manages a distributed directory that is
used to map TCP/IP host names to IP
addresses.
double-byte character large object (DBCLOB)
A graphic string data type in which a
|
sequence of bytes represent double-byte
|
| characters that range in size from 0 bytes
to 2 GB, less 1 byte. In general, DBCLOB
|
values are used whenever a double-byte
|
| character string might exceed the limits of
the VARGRAPHIC type.
|
double-byte character set (DBCS)
A set of characters, which are used by
national languages such as Japanese and
Chinese, that have more symbols than can
be represented by a single byte. Each
character is 2 bytes in length. Contrast
with single-byte character set and
multibyte character set.
526
Application Programming Guide and Reference for Java
double-precision floating point number
A 64-bit approximate representation of a
real number.
DPSI See data-partitioned secondary index.
drain The act of acquiring a locked resource by
quiescing access to that object. Contrast
with claim.
drain lock
A lock on a claim class that prevents a
claim from occurring.
DRDA
See Distributed Relational Database
Architecture.
DRDA access
An open method of accessing distributed
data that you can use to connect to
another database server to execute
packages that were previously bound at
the server location.
DSN
v The default DB2 subsystem name.
v The name of the TSO command
processor of DB2.
v The first three characters of DB2
module and macro names.
dynamic cursor
A named control structure that an
application program uses to change the
size of the result table and the order of its
rows after the cursor is opened. Contrast
with static cursor.
dynamic dump
A dump that is issued during the
execution of a program, usually under the
control of that program.
dynamic SQL
SQL statements that are prepared and
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| executed at run time. In dynamic SQL,
the SQL statement is contained as a
|
character string in a host variable or as a
|
| constant, and it is not precompiled.
EA-enabled table space
A table space or index space that is
enabled for extended addressability and
that contains individual partitions (or
pieces, for LOB table spaces) that are
greater than 4 GB.
EB See exabyte.
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