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

undo
During a takeover or stop-update-to-time operation, after the update has finished its forward
moving redo pass, it reports "undo" when it performs its reverse moving undo pass in order
to back out any updates for transactions that need to be undone. In a takeover operation for
an RDF network, "undo" indicates the first undo pass when local transactions are undone
because their outcomes are unknown.
net
During an RDF network takeover operation, there are three possible undo phases: local undo
(marked "undo" as stated ), file-undo (not marked because this highly rare and typically only
lasts a few seconds), and network undo. The latter is reflected as "net", and this undo pass
backs out transactions for which RDF has a commit record in this system, but a commit is missing
on another backup system in the RDF takeover. See “Network Transactions” (page 286) for the
details of an RDF network takeover operation.
For more information on critical errors, you can scan the EMS collectors on the primary and backup
systems:
• The EMS collector on the primary system contains log messages for the extractor and monitor
processes.
• The EMS collector on the backup system contains log messages for the receiver, purger, and
all updater processes.
Special Messages
If you issue the STATUS RDF command while an RDF TAKEOVER operation is in progress, RDF
displays the current state as “TAKEOVER IN PROGRESS”, as seen in the second example.
If you issue the STATUS RDF command after an RDF TAKEOVER operation has completed, RDFCOM
displays this message instead of the usual status display:
STATUS RDF (\RDF04 -> \RDF06) is NOT running
An RDF TAKEOVER has completed
Safe MAT position is SNO 1, RBA 87876660
MAT position for File Recovery: SNO 1, RBA 87876740
Examples
If you issue the STATUS RDF command post a NSA operation, then the following line is displayed
that provides details of the file on which the NSA operation is being performed:
Reason: NSA Operation performed on \METIS.$FC0500.DB.File
To display current RDF configuration information and operational statistics once, enter this command:
]STATUS RDF
To display that information 10 times, once every minute, enter:
]STATUS RDF, PERIOD 60, COUNT 10
To display current information and statistics for all configured extractor processes once, enter this
command:
]STATUS EXTRACTOR
To display current information and statistics for only those processes (the extractors or any updater)
that have fallen behind the configured RTD threshold (rtd-time), enter this command:
]STATUS RTDWARNING
STOP RDF
The STOP RDF command shuts down RDF.
STOP RDF { [, DRAIN ] }
{ [, REVERSE ] }
242 Entering RDFCOM Commands