BMC Software, Inc., Confidential and Proprietary Information
BMC44200–BMC44299 79
BMC44207I LOGGING STATISTICS - BLOCKS = count, FORCED = count,
PERF % = %
Explanation: This message shows the logging statistics necessary to understand
the performance characteristics of the IMS log integrity function of the BATCH
CONTROL FACILITY (BCF) Physical Logger. This message is provided only when
the log device(s) use BCF buffered device support.
The following values are possible:
BLOCKS count
number of blocks written to the IMS log
FORCED count
number of times the BCF Physical Logger had to synchronize the log for
log write-ahead processing
PERF%
ratio of commits to blocks written
System Action: Processing continues.
User Response: This message is for your information only. No action is necessary.
The PERF%
performance ratio indicates the degree of performance improvement
that can be expected when the IMS log uses buffered tape support. It indicates the
amount of device synchronization necessary to provide database integrity for log
write-ahead requests. The lower this number, the less the job step is delayed by
device synchronization. Factors such as log block size, number of database buffers,
and application design can affect this ratio. Normally, the log block size should be set
to 32760 and the database buffers increased as much as possible until the PERF%
ratio is the lowest value possible.
Log write-ahead ensures that all changes are logged before IMS writes a database
buffer. Small database buffer pools or frequent checkpoints result in frequent writing
of database buffers.
BMC44208E NO LOG DATA SETS USABLE FOR READ
Explanation: The log read routine has determined that none of the log data sets
can satisfy a read request from dynamic backout.
System Action: Processing continues. IMS dynamic backout processing fails. If the
Automatic Backout option is specified as YES, the execution controller will perform
batch backout processing.
User Response: Have the job log data set available if you need to contact BMC
Software Product Support for assistance.
