TMF Introduction (G06.24+)

TMF Overview
HP NonStop Transaction Management Facility (TMF) Introduction—522414-001
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System Operators
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Determining how TMF is to be controlled and monitored:
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Through TMFCOM, the command interface for TMF.
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Through TMFSERVE, which provides programmatic access to TMF through
the Subsystem Programmatic Interface (SPI).
System Operators
System operators are responsible for the following tasks:
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Monitoring TMF status.
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Starting and stopping TMF.
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Reading event messages to determine the status of recovery and other operations.
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Generating routine dumps, such as online dumps, audit dumps, and online
snapshots.
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Mounting and unmounting secondary storage media for dumps.
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Starting the file recovery process after a media failure or an accidental purge.
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Mounting secondary storage media as requested by the file recovery process.
What Are the Benefits of TMF?
Using TMF provides these benefits:
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Increased programmer productivity for applications development and maintenance
Programmers can focus on the business tasks to be accomplished by transactions,
rather than writing code to protect transactions and recover databases.
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Database consistency
Transactions are applied consistently to the database, despite potential accidents
such as program failures, system failures, and media failures.
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Transaction and database protection for distributed data
TMF maintains consistency transparently across all nodes of a network-distributed
database, regardless of where the transaction changing the database originates or
how the database is distributed geographically.
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Very high database availability
Because TMF provides volume recovery to a database after a system failure, a
business loses only a few minutes to recovery downtime for most recoveries.