Availability Guide for Application Design

Glossary
Availability Guide for Application Design—525637-004
Glossary-21
resource manager
resource manager. A subsystem that manges some transactional objects; for example, a
transactional database manager or a transactional queue manager.
restart checkpoint. A checkpoint operation that includes copying a program address to the
backup process. This address becomes the restart point in the backup process if the
primary process of a process pair fails.
retryable operation. An operation that can be safely tried again if the outcome of earlier
attempts is unknown. Contrast with nonretryable operation.
RISC. See reduced instruction-set computing (RISC).
RMS. See Rules Management Service (RMS).
RSC/MP. See Remote Server Call/MP (RSC/MP).
Rules Management Service (RMS). A component of NonStop NET/MASTER services that
helps to simplify automated operation. RMS provides a user interface that speeds up
implementation of Network Control Language (NCL) procedures. See also NonStop
NET/MASTER Management Services and Network Control Language (NCL).
SCF. See Subsystem Control Facility (SCF).
server. A combination of hardware and software designed to provide services in response
to requests received from clients across a network. For example, the parallel servers in
the HP range provide transaction processing, database access, and other services.
See also client, requester, client/server model, and requester/server model.
server class. A grouping of duplicate copies of a single server program, all of which
execute the same object program.
service. A function performed by a server process or program on behalf of a requester or
client. A server can perform one or several services. The concept of a service is built
into the design of products such as the BEA Systems, Inc. Tuxedo system and the
NonStop Tuxedo system.
similarity check. A check that an SQL executor and an SQL compiler can make for an SQL
object in an execution plan to determine whether an invalid plan is operable. The
similarity check is faster than recompilation and reduces downtime for a program.
single-threaded process. A process with one and only one sequential flow of control. A
single-threaded server process, for example, executes one request at a time. A single-
threaded requester handles only one user at a time. Contrast with multithreaded
process.
SNA. See Systems Network Architecture (SNA)
.