Non-Stop Processing › Interval Roll for Statistics

Interval Roll for Statistics

System-wide statistics and histograms can be now automatically written to the log and cleared at a specified time and day. This process ensures that the values of these statistics are synchronized by avoiding overflow. It also makes analysis easier since statistics are gathered over a standard time interval.

A new interval roll time specifies the time of day and day frequency when the statistics are written and reset. When the interval roll time is reached, current system-wide statistics and histograms are written to the CA IDMS log, and then cleared in preparation for the next collection interval.

You can set the interval roll time and day frequency using the new parameters on the SYSGEN SYSTEM statement and the DCMT VARY STATISTICS command. The DCMT DISPLAY STATISTICS command has been enhanced to display the interval roll time, and the DCMT WRITE STATISTICS command provides the ability to both write and clear the statistics.

The following new fields have been added to the #STLDS DSECT that describes the header portion of the statistics records written to the log:

• The time at the start of the interval, in internal timestamp format
• The time when the DC/UCF system started, in internal timestamp format
• The job name of the DC/UCF system
• The Central Version (CV) number

Several statistics reports have been changed to handle the new statistics record layout and to account for the collection of statistics on an interval basis. The affected reports are: SRPT000, SRPT003, SRPT005, SRPT006, SRPT007, SRPT008, SRPT009, SRPT010, SRPT011, SRPT012, SRPT013, SRPT014, SRPT015, SRPT016 and SRPT021.

For more information about statistics and how they are managed, see the System Operations Guide.