invalid package
A package that depends on an object
(other than a user-defined function) that
is dropped. Such a package is implicitly
rebound on invocation. Contrast with
inoperative package.
IP address
A value that uniquely identifies a TCP/IP
host.
IRLM See internal resource lock manager.
isolation level
The degree to which a unit of work is
isolated from the updating operations of
other units of work. See also cursor
stability, read stability, repeatable read,
and uncommitted read.
ISPF See Interactive System Productivity
Facility.
iterator
In SQLJ, an object that contains the result
set of a query. An iterator is equivalent to
a cursor in other host languages.
iterator declaration clause
In SQLJ, a statement that generates an
iterator declaration class. An iterator is an
object of an iterator declaration class.
JAR See Java Archive.
Java Archive (JAR)
A file format that is used for aggregating
many files into a single file.
JDBC A Sun Microsystems database application
programming interface (API) for Java that
allows programs to access database
management systems by using callable
SQL.
join A relational operation that allows retrieval
of data from two or more tables based on
matching column values. See also
equijoin, full outer join, inner join, left
outer join, outer join, and right outer join.
KB Kilobyte. A value of 1024 bytes.
Kerberos
A network authentication protocol that is
designed to provide strong authentication
for client/server applications by using
secret-key cryptography.
Kerberos ticket
A transparent application mechanism that
transmits the identity of an initiating
principal to its target. A simple ticket
contains the principal’s identity, a session
key, a timestamp, and other information,
which is sealed using the target’s secret
key.
key A column, an ordered collection of
columns, or an expression that is
identified in the description of a table,
index, or referential constraint. The same
column or expression can be part of more
than one key.
key-sequenced data set (KSDS)
A VSAM file or data set whose records
are loaded in key sequence and controlled
by an index.
KSDS See key-sequenced data set.
large object (LOB)
A sequence of bytes representing bit data,
single-byte characters, double-byte
characters, or a mixture of single- and
double-byte characters. A LOB can be up
to 2 GB minus 1 byte in length. See also
binary large object, character large object,
and double-byte character large object.
last agent optimization
An optimized commit flow for either
presumed-nothing or presumed-abort
protocols in which the last agent, or final
participant, becomes the commit
coordinator. This flow saves at least one
message.
latch A DB2 mechanism for controlling
concurrent events or the use of system
resources.
LCID See log control interval definition.
LDS See linear data set.
leaf page
An index page that contains pairs of keys
and RIDs and that points to actual data.
Contrast with nonleaf page.
left outer join
The result of a join operation that
includes the matched rows of both tables
that are being joined, and that preserves
the unmatched rows of the first table. See
also join, equijoin, full outer join, inner
join, outer join, and right outer join.
limit key
The highest value of the index key for a
partition.
534 Application Programming Guide and Reference for Java
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