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

Installing and Configuring RDF
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
3-19
Configuring RDF
through Z and you just moved its partition boundary such that tableA now contains
only the keys A through M and a new table (tableB) contains the keys N through Z.
Suppose also that you performed this operation manually on the backup system.
If you then initialize RDF to a point in the MAT prior to the Stop-RDF-Updater record
associated with the partition boundary change and an updater encounters audit
information associated a key N through Z, the updater will report an error because it will
try to apply the audit information to tableA (which used to contain it, but now does
not), and the audit information will not be applied to the backup database. In this
particular case, the database is not corrupted, but data corruption could happen for other
SQL DDL SHARED ACCESS operations.
If you did recently perform an SQL operation with SHARED ACCESS on the primary
system and you want to initialize RDF to a
inittime , you should wait before issuing
the command until you can specify an inittime that includes the three minutes added
by RDFCOM so that the starting position in the MAT is after the Stop-RDF-Updater
record.
As a precaution, if RDFCOM encounters a Stop-RDF-Updater record during its
backward search of the MAT, it issues a warning message asking if you want to proceed
with initialization. Note that if you continue the operation, the updaters will shut down
when they encounter the Stop-RDF-Updater record, at which time you should try to
perform the SQL DDL operation manually again on the backup system.
TMF Shutdown Records
TMF shutdown records in the MAT do not cause a problem, except that RDF shuts down
and you must then restart it.
Configuring RDF
For RDF to operate correctly, you must establish values for the following sets of
parameters in the RDF configuration file:
•
Global parameters that apply across RDF
•
Process parameters that apply to the individual monitor, extractor, receiver, purger,
and updater processes, and to the image trails
In addition to the configuration file on disk, RDFCOM maintains a copy in memory. To
configure RDF, first use RDFCOM SET commands to establish the values you want in
the configuration memory table, and then use ADD commands to apply those values to
the configuration file. You do this for each process individually; do all of the SETs for a
process, and then add the particular object. Notice that the only purpose of the
configuration memory table is to serve as a temporary repository of configuration
options for the SET command.
Initially, some of the configuration options in the memory table are set to their default
values. You use SET commands only for those options that you want to change from the
default value.
Before issuing the ADD commands, you can verify the current option values in the
memory table by issuing SHOW commands.