RDF/IMP, IMPX, and ZLT System Management Manual

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Online Database Synchronization

HP NonStop RDF/IMP, IMPX, and ZLT System Management Manual—524388-002

7-2

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 17DEC2004), 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 NonStop SQL/MP 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.