Availability Guide for Application Design

Glossary
Availability Guide for Application Design—525637-004
Glossary-24
TMDS
TMDS. See HP Maintenance and Diagnostic System (TMDS).
TMF. See token.
TNS/E. Another name for the Y-series servers.
TNS/R. Another name for the S-series servers.
token. In the Subsystem Programmatic Interface (SPI), a distinguishable unit in a message.
Programs place tokens in an SPI buffer using the SSPUT procedure and retrieve them
from the buffer with the SSGET procedure. A token has two parts: an identifying token
code and a value.
TorusNet. Provides the fault-tolerant architecture for connecting processors on the range of
servers.
TP monitor. See transaction-processing monitor (TP monitor).
transaction. An explicitly delimited operation or set of related operations that alters the
content of a database. Each transaction is atomic, consistent, isolated, and durable.
transaction backout. A TMF activity in which the effects of a partially completed
transaction are canceled.
Transaction Delivery Process (TDP). A multithreaded gateway process that can be
replicated. The TDP can manage many connections and workstations at one time and
multiple sessions from each workstation. It is a part of the Remote Server Call/MP
(RSC/MP) product. See also Remote Server Call/MP (RSC/MP).
transaction identifier. A unique name that allows the TMF product to distinguish
transactions when concurrent terminal programs are in transaction mode.
Transaction Management Facility (TMF). A data-management product that maintains the
consistency of a database and provides the tools for database recovery.
transaction manager. Creates transaction identifiers and tracks which resource managers
participate in the transaction. Provides the transaction application programming
interface (begin, commit, and abort) and manages the associated functions in addition
to file recovery and volume recovery. See also transaction identifier, resource
manager, file recovery, and volume recovery.
transaction playback. A technique for placing transaction requests on a transaction-
protected queue while the server system is unavailable. The server reads these
requests from the queue when it becomes available again. This technique works for
applications for which the order in which requests are processed is unimportant.
Contrast with trickle catchup.