Glossary
N
NAU
Network addressable unit.
NDS
Network Directory Services.
nested table expression
A result table obtained directly or
indirectly from one or more other tables through the evaluation of a
fullselect that is specified in the FROM clause.
NETID
Network identifier. Synonym for network
name.
network address
An identifier for a node in a network.
network addressable unit (NAU)
A logical unit (LU), physical unit (PU),
control point (CP), or system services control point (SSCP). It is the origin
or the destination of information transmitted by the path control network. See
also network name.
Network Directory Services (NDS)
A global, distributed, replicated database
introduced in NetWare** Version 4.0 that maintains information about, and
provides access to, every resource on the network. The NetWare Directory
database organizes objects, independent of their physical location, in a
hierarchical tree structure called the directory tree.
network name
In SNA, a symbolic name by which end users
refer to a network addressable unit (NAU), a link station, or a link.
Synonymous with NETID.
network node (NN)
In APPN, a node on the network that
provides distributed directory services, topology database exchanges with
other APPN network nodes, and session and routing services. Synonym for APPN
network node.
network node server
An APPN network node that provides network
services for its local logical units and adjacent end nodes.
network-qualified name
The name by which an LU is known
throughout an interconnected SNA network. A network-qualified name consists of
a network name identifying the individual subnetwork, and a network LU name.
Network-qualified names are unique throughout an interconnected network. Also
known as the network-qualified LU name, or fully qualified LU name.
network services
The services within network addressable
units that control network operation through SSCP-SSCP, SSCP-PU, SSCP-LU, and
CP-CP sessions.
NN
Network node.
node
(1) In database partitioning, synonymous with
database partition.
(2) In hardware, a uniprocessor or symmetric
multiprocessor (SMP) computer that is part of a clustered system or a
massively parallel processing (MPP) system. For example, RS/6000 SP is an MPP
system that consists of a number of nodes connected by a high-speed network.
(3) In communications, an end point of a
communications link, or a junction common to two or more links in a network.
Nodes can be processors, communication controllers, cluster controllers,
terminals, or workstations. Nodes can vary in routing and other functional
capabilities.
node directory
A directory that contains information
necessary to establish communications from a client workstation to all
applicable database servers.
nodegroup
A named group of one or more database
partitions.
noncondensed attribute
A table attribute indicating that the
table contains a history of changes to the data, not current data. A table
that has this attribute set includes more than one row for each key value.
nondelimited ASCII (ASC) format
A file format used to import data.
Nondelimited ASCII is a sequential ASCII file with row delimiters used for
data exchange with any ASCII product.
normalization
In databases, the process of restructuring
a data model by reducing its relations to their simplest forms. (T)
not-fenced
A type of user-defined function or stored
procedure that is defined to be run in the DBMS process. Contrast with fenced.
not-variant function
A user-defined function whose result is
solely dependent on the values of the input arguments. Successive invocations
with the same argument values always produce the same results. Contrast with
variant function.
nullable
The condition where a value for a column,
function parameter, or result can have an absence of a value. For example, a
field for a person's middle initial does not require a value.
null value
A parameter position for which no value is
specified.
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