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

Entering RDFCOM Commands
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
8-63
Command Overview
The default updater delay is the recommended value for virtually all users of RDF.
Lowering it could adversely affect other updaters’ performance.
UPDATERTXTIME tx-time
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 could 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.
UPDATERRTDWARNING rtd-time
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. Besides the monitor process
(and perhaps the extractor), the display includes only those updaters, if any, whose
RTD exceeds the configured updater RTD warning threshold.
UPDATEROPEN access-mode
specifies the access mode (PROTECTED or SHARED) that updaters use when
opening database files. The default is PROTECTED.
Protected access is strongly recommended at all times, except when you specifically
wish to take dumps of the backup database with the updaters running. After
dumping is finished, you should change the access mode from SHARED back to
PROTECTED.
To change the configured updater
access-mode, do as follows:
1. Stop RDF
2. Issue an ALTER RDF UPDATEROPEN command specifying the desired
access mode
3. Restart RDF
SOFTWARELOC $volume.subvolume
specifies where the RDF software is installed. The default is $SYSTEM.RDF.