Where Issued; Security Restrictions; Rdf State Requirement; Usage Guidelines - HP NonStop RDF J-series RVUs Management Manual

trigger-type
is REVERSE or TAKEOVER. This command parameter alters a trigger that has already been
added to the RDF configuration.

Where Issued

These commands can be issued only at the primary system, except altering the TAKEOVER
trigger, which can also be issued on the backup system if and only if the primary system is not
available.
NOTE: You should only alter the TAKEOVER trigger on the backup system if you are about
to issue the TAKEOVER command. If you alter this trigger on the backup system at any other
time, you must remember to issue the same alter command on the primary system when it is
available again. If you fail to do this, then the next time you start RDF, the trigger information
on the primary system is copied to the backup system, and the changes you had made to the
trigger on the backup system are then lost.

Security Restrictions

You can issue the ALTER command if you are a member of the super-user group.

RDF State Requirement

While RDF is running, the only configuration parameters you can alter are the log file, the purge
time, the RDF updater delay, the RDF UPDATEROPEN, and the priority of each RDF process.
To change the setting of any other parameter, you must first stop RDF.

Usage Guidelines

Before entering the ALTER command, you can display the current configuration parameters
with the INFO RDF command. After entering ALTER, you can confirm your changes by again
entering INFO RDF.
For using ALTER RDF UPDATEROPEN to coordinate the taking of online dumps or reloads on
the backup system, see the discussion in
If you use an ALTER RECEIVER command to change the EXTENTS parameter, the change will
occur on the next RDF image file rollover, unless RDF has never been started since its last
reinitialization.
Although you can use the SET RECEIVER RDFVOLUME command to specify the disk volume
used for the master image trail, you cannot re-specify this volume by entering an ALTER
RECEIVER RDFVOLUME command. To change this volume, you must reinitialize RDF and use
another SET RECEIVER RDFVOLUME command followed by an ADD RECEIVER command.
If you need to change an updater's image trail volume, it is recommended that you stop TMF;
wait for RDF to stop; delete the volume; re-add the volume back into the configuration, associating
it to a different image trail volume; and then restart the TMF and RDF subsystems. This is the
only way to ensure that the backup database will remain synchronized with the primary database.
NOTE:
Altering the RDF UPDATERDELAY value is not recommended unless you have a very
specific reason for doing so; any value less than the default (10 seconds) can affect updater
performance.

Examples

To change the priority at which an extractor process is currently running, issue an ALTER
EXTRACTOR PRIORITY command. For example, the following command changes the execution
priority of the master extractor process to 170:
]ALTER EXTRACTOR PRIORITY 170
196 Entering RDFCOM Commands
Chapter 5 (page 121).