TMF Operations and Recovery Guide (G06.24+)

Occasional Operations

HP NonStop TMF Operations and Recovery Guide—522417-002

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Controlling Transaction Processing

Occasionally, you may have to interrupt the normal flow of TMF operations by

manipulating when or for how long transactions are processed. This section describes

the situations that may require your intervention, and how to manage each situation.

You must be a member of the super user group to issue the TMFCOM commands

described in this section (see the TMF Reference Manual for instructions on using

these commands).

Delaying Transaction Processing

Normally, transaction processing can begin immediately after TMF is started. In certain

situations, you might want to start TMF, but prevent application programs from

beginning transaction processing. For example, before starting transaction processing,

you might want to:

•

Allow volume recovery to run.

•

Check the success of a volume recovery.

•

Complete an online dump, so that transaction processing performance is not

affected.

To delay transaction processing, issue the START TMF command with the DISABLE

BEGINTRANS option:

TMF 10> START TMF, DISABLE BEGINTRANS

To start transaction processing later, use the ENABLE BEGINTRANS command.

Enabling New Transactions

On most systems, transaction processing should run constantly, unless a maintenance

operation or system failure causes it to stop. This section describes the situations that

can prevent new transactions from starting, and contains suggestions for recovery.

Once you clear the condition that prevented new transactions, you can use the

ENABLE BEGINTRANS command to restart transaction processing.

Reason: The TMF subsystem is not running

Meaning. TMF is not in the started state, so it cannot accept new transactions.

Action. Check the STATUS TMF display to see the TMF state; if it is starting, no action

is necessary. Transactions will be enabled when the TMF state reaches started

(unless TMF has been started with the DISABLE BEGINTRANS option). If TMF is in

the stopping state, it has disabled the BEGINTRANSACTION procedure as part of its

shutdown process. If TMF is in the stopped state, it is completely shut down. To start

TMF with transaction processing enabled, use the START TMF command without

options.