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

Online Database Synchronization
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
7-2
Synchronizing Entire Databases Online
Synchronizing Entire Databases Online
To synchronize an entire RDF backup database to the primary database online, do as
follows.
1. If RDF is currently running, issue a STOP RDF command on the primary system.
2. Purge the RDF control subvolume and then issue an INITIALIZE RDF command of
the following form on the primary system:
INITIALIZE RDF, BACKUPSYSTEM \system, SYNCHDBTIME ddmmmyyyy hh:mm
where system is the name of the backup system, ddmmmyyyy is today’s date
(such as 17DEC2002), and hh:mm is an appropriate timestamp prior to the current
time (see the description of the INITIALIZE RDF command in Section 8).
3. Configure RDF and then issue a START RDF, UPDATE OFF command on the
primary system.
4. Make a copy of all tables and files in the database as follows:
Create an empty set of duplicate key-sequenced and relative tables and files
on either the primary or backup system. The duplicate tables and files must
not be audited.
You can create these files and tables on either the primary or backup system,
but you should only create them on the backup system if you have sufficient
Expand bandwidth between the two systems to handle both the audit sent by
the extractor and the data sent by the load operations.
5. Using load commands, populate the empty tables and files.
For SQL tables, use SQLCI LOAD commands with the SHARE option.
For Enscribe files, use FUP LOAD commands with the SHARE option.
6. When the load operations are done, issue the RDFCOM STOP SYNCH command
on the primary system. This command issues a message to the extractor. The
purpose of this command is to enable RDF to determine when the synchronization
operation has completed and the backup database is synchronized with the
primary database.
When the extractor completes its role in the online synchronization operation, it
generates the RDF Event 782 and then resumes normal operations. For more
Note. If you have multiple RDF environments, be sure to specify an appropriate SUFFIX
parameter in the above INITIALIZE RDF command to keep this RDF configuration
separate from the other RDF configurations on the primary system. Also, if this
configuration is to protect different data from the other RDF configurations, you might want
to consider using the INCLUDE and EXCLUDE options for your updaters.