RDF/IMP, IMPX, and ZLT System Management Manual

Online Database Synchronization
HP NonStop RDF/IMP, IMPX, and ZLT System Management Manual—524388-002
7-13
Partial Database Synchronization Issues
Example #2 – Synchronization of an Individual Volume
Suppose you just need either to synchronize a new volume to an existing RDF
configuration, or you need to re-synchronize an existing volume in your configuration.
You would first stop your current RDF subsystem. You then delete your current RDF
control subvolume and initialize a new RDF subsystem, using the SYNCHDBTIME
option. For the timestamp to be used with the SYNCHDBTIME parameter, you specify
a timestamp following the guidelines for the INITTIME option.
When you create your new RDF configuration:
•
If you are synchronizing a new volume, add it to your new configuration.
•
If you are resynchronizing an existing volume, then just use your existing RDF
configuration.
You then follow the guideline for an entire database synchronization operation, except
that you only need to create and load copies of the files and tables on the one volume.
Example #3 – Synchronization of an Individual File or
Partition on a Volume
Suppose you just need to re-synchronize a single file or partition on an existing volume
in your RDF configuration. You would first stop your current RDF subsystem. You then
delete your current RDF configuration and initialize a new RDF subsystem, using the
SYNCHDBTIME option. For the timestamp to be used with the SYNCHDBTIME
parameter, you specify a timestamp following the guidelines for the INITTIME option.
When you configure a new RDF subsystem, use your existing RDF configuration file.
You then follow the guideline for an entire database synchronization operation, except
that you only need to create and load a copy of the one file or partition.
Partial Database Synchronization Issues
There are many considerations when synchronizing selected portions of a database.
You should read this section carefully before attempting to perform the operation.
Typically you need to perform a partial database synchronization for either of two
reasons:
•
You are adding a new volume to the RDF configuration that was not previously in
your configuration.
•
You have encountered a problem with a volume or a file that requires
resynchronization.
As stated above, a partial database synchronization follows the same steps as those
for synchronizing an entire database, except that you only need to create and load
duplicate copies of the files or tables to be synchronized. Also, when determining what
timestamp to specify with the SYNCHDBTIME parameter, you should follow the
guidelines for the INITTIME option.