IBM DB2 Manual page 533

basic row format
|
| A row format in which values for
columns are stored in the row in the
|
order in which the columns are defined
|
| by the CREATE TABLE statement.
Contrast with reordered row format.
|
basic sequential access method (BSAM)
An access method for storing or retrieving
data blocks in a continuous sequence,
using either a sequential-access or a
direct-access device.
| BEFORE trigger
| A trigger that is specified to be activated
before a defined trigger event (an insert,
|
| an update, or a delete operation on the
| table that is specified in a trigger
definition). Contrast with AFTER trigger
|
| and INSTEAD OF trigger.
binary large object (BLOB)
A binary string data type that contains a
|
sequence of bytes that can range in size
|
| from 0 bytes to 2 GB, less 1 byte. This
string does not have an associated code
|
page and character set. BLOBs can
|
| contain, for example, image, audio, or
video data. In general, BLOB values are
|
used whenever a binary string might
|
| exceed the limits of the VARBINARY
type.
|
binary string
A sequence of bytes that is not associated
|
| with a CCSID. Binary string data type can
be further classified as BINARY,
|
| VARBINARY, or BLOB.
| bind A process by which a usable control
| structure with SQL statements is
generated; the structure is often called an
|
| access plan, an application plan, or a
package. During this bind process, access
|
paths to the data are selected, and some
|
| authorization checking is performed. See
also automatic bind.
|
bit data
v Data with character type CHAR or
|
| VARCHAR that is defined with the
| FOR BIT DATA clause. Note that using
BINARY or VARBINARY rather than
|
| FOR BIT DATA is highly
recommended.
|
v Data with character type CHAR or
|
VARCHAR that is defined with the
|
| FOR BIT DATA clause.
v A form of character data. Binary data is
|
| generally more highly recommended
than character-for-bit data.
|
BLOB See binary large object.
block fetch
A capability in which DB2 can retrieve, or
|
| fetch, a large set of rows together. Using
block fetch can significantly reduce the
|
number of messages that are being sent
|
| across the network. Block fetch applies
only to non-rowset cursors that do not
|
| update data.
bootstrap data set (BSDS)
A VSAM data set that contains name and
status information for DB2 and RBA
range specifications for all active and
archive log data sets. The BSDS also
contains passwords for the DB2 directory
and catalog, and lists of conditional
restart and checkpoint records.
BSAM
See basic sequential access method.
BSDS See bootstrap data set.
buffer pool
| An area of memory into which data pages
are read, modified, and held during
|
processing.
|
built-in data type
| A data type that IBM supplies. Among
the built-in data types for DB2 for z/OS
|
are string, numeric, XML, ROWID, and
|
| datetime. Contrast with distinct type.
built-in function
A function that is generated by DB2 and
|
| that is in the SYSIBM schema. Contrast
with user-defined function. See also
|
function, cast function, external function,
|
| sourced function, and SQL function.
business dimension
A category of data, such as products or
time periods, that an organization might
want to analyze.
cache structure
A coupling facility structure that stores
data that can be available to all members
of a Sysplex. A DB2 data sharing group
uses cache structures as group buffer
pools.
CAF See call attachment facility.
517
Glossary