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

Entering RDFCOM Commands
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
8-96
Command Overview
Regardless of whether the RDF monitor was started during execution of the most
previous TAKEOVER command, it is started when this command is reissued.
It is conceivable that one or more transactions could get committed on the primary
database immediately prior to the TAKEOVER operation but that their commit records
did not reach the backup system before the primary system failure. If that happens, the
audit data for the affected transactions is not committed on the backup system and is
instead written to the exception file. In such a case, your database administrator might
be able to use RDFSNOOP to examine the affected data pointed to by the exception file.
For information about using RDFSNOOP, refer to Appendix B, Additional Reference
Information.
If the failed primary system is eventually restored to operation, and you want it to
function again as the primary system, do the following:
1. Stop the applications and TMF on the old backup system.
2. Back up the database on the old backup system and restore it to the old primary
system.
3. Configure TMF on the old primary system.
4. Initialize RDF on the old primary system.
5. Restart TMF on the old backup system and turn the audit flags off on the backup
database.
6. Start the TMF and RDF subsystems on the old primary system.
7. Start the applications on the old primary system.
Example
The following command sequence initiates RDF TAKEOVER processing in which the
backup system \TORONTO takes over processing from the primary system \SANFRAN.
1. From the TACL command interpreter on the backup system (\TORONTO), enter:
>RDFCOM SANFRAN
2. From within the RDFCOM session, enter:
]TAKEOVER
3. RDF displays the following prompt message:
*** TAKEOVER assumes a disaster on \SANFRAN has occurred.
Are you sure you want to TAKEOVER?
To proceed with the TAKEOVER operation, enter Y or YES.
To stop the TAKEOVER operation, enter N or NO.
After you enter your response, RDFCOM prompts you for your next command.
4. Having initiated the RDF TAKEOVER operation, you can then use a STATUS RDF
command to determine the status of the TAKEOVER operation. If the TAKEOVER