RDF/IMP and IMPX System Management Manual (RDF 1.4+)

Entering RDFCOM Commands
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
8-97
Command Overview
RDF State Requirement
You can issue the STOP UPDATE command only when RDF is running.
Usage Guidelines
When you disable updating with the STOP UPDATE command, the TMF audit images
and commit/abort records from the MAT are still transmitted to the backup system as
they are generated by transactions. This functional characteristic ensures that, if an
RDF TAKEOVER operation becomes necessary, the backup system database can be
made current by the TAKEOVER command.
Use the STATUS RDF command to determine whether updating is enabled or
disabled. If updating is disabled, the STATUS RDF display specifies the state “Update
stopped” and shows no status information for the updater processes.
The STOP UPDATE command is useful when you want to produce reports from the
database on the backup system. (For more information, see Reading the Backup
Database and Access to Backup Databases in a Consistent State in section 5.) If the
STOP UPDATE command includes the TIMESTAMP parameter, RDFCOM returns a
prompt as soon as all processes have been advised of the stop operation. If the STOP
UPDATE command does not include the TIMESTAMP parameter, however, RDFCOM
does not return a prompt until all updater processes stop on the backup system. When
the prompt does appear, start the reporting processes on the backup system. After
reporting has completed, enter the following command to resume updating:
]START UPDATE
Updaters cannot always respond immediately to a STOP UPDATE command. If an
updater has audit information queued for the disk process, the updater must wait until
all of that information is processed before it can shut down.
If you erroneously set the timestamp too far into the future (for example, 26NOV2000),
the only way to correct this mistake is to enter a STOP RDF command, restart RDF,
and reenter the STOP UPDATE command with the correct timestamp.
Examples
To suspend updating activities and stop the updater processes, enter the following
command:
STOP UPDATE
To suspend updating activities and stop the updaters from processing transactions
committed by 2:30 P.M. or later on January 20, 2000, enter the following command:
STOP UPDATE, TIMESTAMP 20JAN2000 14:30
Note. RDF always starts with updating enabled, unless you explicitly specify UPDATE OFF in
the START RDF command. This scenario is true even if updating was disabled when RDF
was last stopped.