TMF Glossary (G06.24+)

TMF Glossary
HP NonStop TMF Glossary—522415-002
Glossary-17
TMF incarnation
TMF incarnation. Each new creation of a TMF configuration begins with a DELETE TMF
command and is referred to as an incarnation; any previous configuration is erased.
TMF uses unique identifiers to distinguish between information and resources
associated with particular TMF incarnations.
TMF operation. A TMF function, such as TMF Start, TMF Stop, or file recovery. TMF
recognizes each specific instance of an operation as unique and assigns a unique
operation serial number to distinguish this operation from other recent operations of the
same type.
TMF scratch tapes. A tape volume that is available for writing dumps, defined as such in
the TMF catalog.
TMF subvolume. The subvolume where TMF configuration files and the TMF catalog
reside. The default is $SYSTEM.ZTMFCONF.
TMFCOM. The TMF interactive command interface, which allows operators to enter
commands and receive responses through a terminal keyboard and monitor.
TMFLIB. A set of subroutines in the system library that exists in each processor in the
NonStop system and controls transactions within the system. The set includes
application interface procedures such as BEGINTRANSACTION and
ENDTRANSACTION; it also contains procedures called by privileged processes.
TMP. See transaction management process (TMP).
TMP memory threshold. The percentage of extended segment memory allocated to the
TMP that can be used before TMF disables new transactions.
transaction. An operation or a series of operations that transforms a database from one
consistent state to another. TMF treats transactions as a single unit; either all of the
changes made by a transaction are made permanent (the transaction is committed) or
none of the changes are made permanent (the transaction is aborted). If an error
occurs while a transaction is in progress, TMF backs out whatever partial changes
were made to the database, leaving it in a consistent state. In application programs,
transactions are begun by using BEGINTRANSACTION statements, ended by using
ENDTRANSACTION statements, and aborted by using ABORTTRANSACTION
statements.
transaction backout. See backout.
transaction control records. A type of audit trail record that identifies transaction-related
events such as transaction committed, transaction aborted, and undo incomplete.
Together with before-images and after-images, these records constitute a
chronological record of all transaction-related activities.
transaction identifier (TransID). A unique name that TMF assigns to a transaction.
Transaction Management Facility (TMF). See TMF.