IBM DB2 Manual page 553

LUW See logical unit of work.
LUWID
See logical unit of work identifier.
mapping table
A table that the REORG utility uses to
map the associations of the RIDs of data
records in the original copy and in the
shadow copy. This table is created by the
user.
mass delete
The deletion of all rows of a table.
materialize
v The process of putting rows from a
view or nested table expression into a
work file for additional processing by a
query.
v The placement of a LOB value into
contiguous storage. Because LOB
values can be very large, DB2 avoids
materializing LOB data until doing so
becomes absolutely necessary.
materialized query table
A table that is used to contain information
that is derived and can be summarized
from one or more source tables. Contrast
with base table.
MB Megabyte (1 048 576 bytes).
MBCS See multibyte character set.
member name
The z/OS XCF identifier for a particular
DB2 subsystem in a data sharing group.
menu A displayed list of available functions for
selection by the operator. A menu is
sometimes called a menu panel.
metalanguage
A language that is used to create other
specialized languages.
migration
The process of converting a subsystem
with a previous release of DB2 to an
updated or current release. In this
process, you can acquire the functions of
the updated or current release without
losing the data that you created on the
previous release.
mixed data string
A character string that can contain both
single-byte and double-byte characters.
mode name
A VTAM name for the collection of
physical and logical characteristics and
attributes of a session.
modify locks
An L-lock or P-lock with a MODIFY
attribute. A list of these active locks is
kept at all times in the coupling facility
lock structure. If the requesting DB2
subsystem fails, that DB2 subsystem's
modify locks are converted to retained
locks.
multibyte character set (MBCS)
A character set that represents single
characters with more than a single byte.
UTF-8 is an example of an MBCS.
Characters in UTF-8 can range from 1 to 4
bytes in DB2. Contrast with single-byte
character set and double-byte character
set. See also Unicode.
multidimensional analysis
The process of assessing and evaluating
an enterprise on more than one level.
Multiple Virtual Storage (MVS)
An element of the z/OS operating system.
This element is also called the Base
Control Program (BCP).
multisite update
Distributed relational database processing
in which data is updated in more than
one location within a single unit of work.
multithreading
Multiple TCBs that are executing one
copy of DB2 ODBC code concurrently
(sharing a processor) or in parallel (on
separate central processors).
MVS See Multiple Virtual Storage.
| native SQL procedure
An SQL procedure that is processed by
|
converting the procedural statements to a
|
| native representation that is stored in the
database directory, as is done with other
|
SQL statements. When a native SQL
|
| procedure is called, the native
representation is loaded from the
|
directory, and DB2 executes the
|
| procedure. Contrast with external
procedure and external SQL procedure.
|
nested table expression
A fullselect in a FROM clause
(surrounded by parentheses).
537
Glossary