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

UPDATERFOPENTHRESHOLD Attribute
The UPDATERFOPENTHRESHOLD attribute enables you to set a limit on the number of files that
can be opened by a RDF Updater process. The default value for this attribute is 80% of the value
of Maximum Number of Concurrent File Opens for an RDF Updater process. The value of Maximum
Number of Concurrent File Opens is 3000. Therefore, the default threshold value of
UPDATERFOPENTHRESHOLD is 2400.
Set the threshold value by using the SET RDF command, when RDF is not running. It can be modified
only using ALTER RDF, when RDF is not running. When an RDF Updater exceeds the threshold
value, EMS event 933 is returned. This signals the administrator to rebalance the number of audited
files on the primary and backup for the affected Updater after shutting down RDF. This event does
not have any impact on the Updater processing and performance and RDF Updater continues to
process normally.
UPDATERNSASUSPEND Attribute
The UPDATERNSASUSPEND attribute specifies the mode of shutdown for Updaters when they
encounter Stop-RDF-Updater records in the MAT during a NonStop Shared Access DDL operation.
The default value of this attribute is OFF.
When this attribute is set to ON, Updaters will suspend due to a NonStop Shared Access DDL
operation, after completing their current transaction.
When this attribute is set to OFF, Updaters will shut down, due to a NonStop Shared Access DDL
operation, after completing their current transaction.
UPDATERTXTIME Attribute
The UPDATERTXTIME attribute specifies the maximum transaction duration in seconds (from 10 to
300) for all updater processes. The default is 60 seconds.
RDF updaters operate in transaction mode. Updater transactions are essentially long-running
transactions that pin audit trail files on the backup system and can affect the duration of backout
operations if an updater transaction aborts for any reason.
The default value is recommended for RDF environments with heavy updater activity (aggregate
updater throughput greater than 300 kb/second). Raising the tx-time in such environments
might adversely affect TMF performance on the backup system.
In RDF environments with low to moderate updater activity and where no other transaction activity
is occurring on the backup system, you could raise the tx-time without affecting TMF performance
on the backup system.
The goal of the UPDATERTXTIME is to allow each updater to do as much work as possible in a
single transaction, but not so much work that it would take a long time to undo the transaction, if
that transaction should abort. For this reason the default value of 60 seconds is generally an optimal
value.
UPDATERRTDWARNING Attribute
The UPDATERRTDWARNING attribute specifies the RTD warning threshold (in seconds, 0 or greater)
for all configured updaters. The default is 60 seconds.
This threshold is used by the STATUS RTDWARNING command to determine which updaters, if
any, are to be included in its display. The display includes the monitor process and only those RDF
processes (extractor or updaters) whose RTD exceeds their configured RTD warning threshold.
UPDATEROPEN Attribute
The UPDATEROPEN attribute specifies the access mode (PROTECTED, PROTECTED OPEN, or
SHARED) that updaters use when opening database files. The default is PROTECTED.
PROTECTED mode is strongly recommended at all times to protect your backup database from
improper write activity by processes other than an RDF updater. PROTECTED mode also allows
Initializing and Configuring RDF 75