RDF System Management Manual for J-series and H-series RVUs (RDF Update 13)

Figure 3 RDF Tasks to Maintain a Copy of a Database
Extractor
Primary
Secondary
Receiver
Captures audit trail records
Filters and transmits audit
trail data to backup system
Receives and writes audit
trail data to image file
Network Communication
(Expand Network)
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
Updater
RDF Processes
To accomplish its four major tasks, RDF runs different processes on the primary system and the
backup system. These processes (the monitor and extractor on the primary system and the receiver,
updaters, and purger on the backup system) divide these tasks as summarized in the following
pages. The relationship of these processes to one another is illustrated in Figure 4. More details
about their operation appear in“RDF Operations” (page 31) .
30 Introducing RDF