RDF/IMP, IMPX, and ZLT System Management Manual

Introducing RDF
HP NonStop RDF/IMP, IMPX, and ZLT System Management Manual—524388-002
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User Interfaces
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Access to Consistent Backup Databases
There are two ways to quiesce the backup database in a logically consistent state
with regard to transaction boundaries: stop TMF on the primary system or use the
TIMESTAMP parameter in a STOP UPDATE command (referred to as a stop-
update-to-time operation). The latter allows you to do so without stopping TMF,
your applications, or the RDF extractor.
User Interfaces
To use RDF, you run two online utilities: RDFCOM and RDFSCAN. Both are
interactive command interpreters through which you begin a session and enter
requests to the subsystem.
RDFCOM for Subsystem Management and Operations
To manage, operate, and control RDF, use the RDFCOM utility. You can issue
commands to:
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Configure RDF
•
Control RDF operation
•
Obtain status information about RDF regarding database activity on the primary
system and processing on the backup system
Tasks and examples using RDFCOM commands appear throughout the manual.
Reference information for all commands appears in Section 8, Entering RDFCOM
Commands.
Scanning the EMS Event Log
RDF writes messages to the EMS event log when any of the following occurs:
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RDF is initialized
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RDF is started or stopped
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Updating is started or stopped
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RDF issues an informational, warning, or error message (including RTD warning
messages)
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An RDF process takeover occurs
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Control switches from the primary to the backup database
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A NonStop SQL/MP DDL operation using the WITH SHARED ACCESS option is
detected
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An exception record is written