Availability Guide for Application Design

Glossary
Availability Guide for Application Design—525637-004
Glossary-22
SNAX product family
SNAX product family. The product family that consists of those HP software products that
provide access through a reliable communication protocol to IBM Systems Network
Architecture (SNA) networks.
SPI. See Subsystem Programmatic Interface (SPI).
SQL. See Structured Query Language (SQL).
SQL object. An entity that is created, manipulated, or dropped by SQL statements and that
is described in an SQL catalog. SQL objects include tables, views, indexes, partitions,
columns, and catalogs.
stack marker. The three words at the beginning of each procedure’s memory stack frame,
used to separate one stack frame from another and to provide return information for
use when the procedure has finished.
stand-in processing. Part of an application that becomes operational only if the regular
application logic stops. Stand-in processing typically provides reduced function but
enough to keep the application available until the application is once more fully
operational.
static server. A server process that the PATHMON process creates when a START
SERVER command is issued. The PATHMON process starts the number of static
servers configured for the server class. See also dynamic server.
Structured Query Language (SQL). A relational database language used to define,
manipulate, and control databases. SQL statements can be embedded in programs or
entered as commands through SQLCI.
subdevice. A recipient of requests within a subsystem. A subdevice often corresponds to a
real external entity.
subsystem. In the context of the Subsystem Programmatic Interface (SPI) and the Event
Management Service (EMS), a process or collection of processes that gives users
access to a set of related resources or services. A subsystem typically controls a
cohesive set of objects.
Subsystem Control Facility (SCF). A management application within the Distributed
Systems Management (DSM) architecture. SCF can be used to change the
characteristics of communications lines, devices, and subdevices for most
communications products, without having to take your NonStop system down.
subsystem identifier. A data structure that uniquely identifies a subsystem (including
whether it is an HP subsystem or a user subsystem). It consists of the name of the
owner of the subsystem (the company that provides it), a subsystem number that
denotes the subsystem within the scope of its owner, and a subsystem version
number. The subsystem identifier is an argument to most of the SPI procedures.