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

Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
7-1
7
Online Database Synchronization
With RDF/MPX and IMPX you can synchronize entire databases or selected volumes
while your applications continue to run.
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 17JUN2000), 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. For key-sequenced or relative tables and files, 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 be
nonaudited. You should create them on the backup system only if there is
sufficient bandwidth between the two systems such that the load operations to
populate the tables and files will not interfere with the ability of the extractor
process to send audit data to the backup system.
Use SQLCI LOAD commands with the SHARE option to load the SQL tables
and FUP LOAD commands with the SHARE option to load the Enscribe files.
Caution. You cannot synchronize individual tables or files online. If you attempt to perform
any of the protocols described in this section without synchronizing all of the tables and files in
the database or on individual volumes, the updaters might encounter problems and the
synchronization operation will not complete successfully. To synchronize individual tables or
files, you must still stop the TMF product and let the updaters quiesce before doing so.
Note. If you have multiple RDF environments, you can do online synchronization within
one RDF environment without disturbing any of the other RDF environments. Just be sure
to include the appropriate SUFFIX parameter in the above INITIALIZE RDF command.