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

Introducing RDF
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
1-9
Tasks
Figure 1-2 illustrates these tasks as they are performed during normal processing when
RDF updating is enabled. The sequence of events differs when updating is disabled, as
explained under RDF Operations.
Figure 1-2. RDF Tasks to Maintain a Copy of a Database
Reads image file and
issues REDO request
to disk process,
supplying image records
for REDO operation.
Disk process performs
requested REDO
operation, updating
the backup database.
Legend
Primary system
Backup system
Receives and writes
audit trail data to
image file.
Captures audit trail
records.
Filters and transmits
audit trail data to
backup system.