RDF/IMP and IMPX System Management Manual (RDF 1.3+)

Entering RDFCOM Commands
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
8-41
Command Overview
initialize RDF. In this case, the extractor will transmit audit from the beginning of
the first master audit trail (MAT) file (AA000001).
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If you include the TIMESTAMP option in the INITIALIZE RDF command,
RDFCOM searches backwards in the MAT for a TMF shutdown record with the
specified timestamp. If you include the INITTIME or SYNCHDBTIME option,
RDFCOM searches backwards in the MAT for the first commit or abort record
whose timestamp is less than the specified timestamp. When it finds the shutdown
record or commit/abort record, RDFCOM sets the context of the extractor to the
record following that record.
•
When RDF is initialized, the contexts of the receiver and all updaters are initialized
to the beginning of the first image file (AA000001). When RDF is started for the
first time after it has been initialized, any existing image files are purged.
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If you plan to include the TIMESTAMP option in the INITIALIZE RDF command,
make sure that the primary system database is backed up after the TMF shutdown so
that the backup database can be restored at this point in the audit trail. Consider the
following example:
a. TMF and RDF subsystems are running.
b. TMF subsystem is stopped, and RDF subsystem subsequently stops.
c. TMF subsystem is started and application processing resumed.
d. TMF subsystem is stopped.
If you initialize RDF at the shutdown point at Step d, you should restore on the
backup system a copy of the primary system database taken at Step d. The
databases would not be synchronized if the database at Step b was restored to the
backup system.
If you initialize RDF to the timestamp corresponding to Step b, you should restore
on the backup system a copy of the primary system database taken at Step b.
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Initialize RDF at the most recent TMF shutdown point. If you initialize RDF at an
earlier shutdown point, RDF operations will start at that point but will shut down
when the next TMF shutdown point is reached. In this case, you must restart RDF
quickly so that operations on the backup system do not fall behind those on the
primary system. If you choose to initialize RDF at a TMF shutdown point that is not
the most recent, watch the RDF log for the RDF shutdown message and then restart
RDF immediately.
•
If you include the TIMESTAMP option in the INITIALIZE RDF command, use the
following guidelines to determine when you must restore the backup database:
•
If you are going to start RDF with UPDATE ON, restore the database to the
backup system before you start RDF.
•
If you are going to start RDF with UPDATE OFF, you do not have to restore the
database. However, if the need for an RDF takeover arises, you must then
restore the database on the backup system before you issue the TAKEOVER
command.