Periodic Statistics definition

The Periodic Statistics Manager is a tool that enables you to define and collect data based on the following types of periodic statistics:

• Periodic Calendar Statistics: Enables you to collect run time statistics based on periods defined in one specific periodic calendar. There are separate statistics on a specific job or set of jobs for different periods during the week, month, or year. These periods are defined in a Periodic Calendar (see Calendar management).

  EXAMPLE: If the average run time of a job during work days is not the same as the average run time during weekends, there is an advantage to collecting statistics for this job separately for work days and for weekend periods. The average run times will be much more accurate for each period.

• Dynamic Periodic Statistics: Enables you to collect run time statistics for a group of jobs based on a period of time that begins when the associated condition is added to the Active Conditions list, and ends when the condition is removed from the Active Conditions list. The statistics are gathered for the filtered jobs during the period. The period is identified by the last character of the condition name, which has Order Date set to No Date.

  EXAMPLE: If the average run time of a jobs today are not the same as usual because one computer instead of two are running the jobs. This case is not associated with a period in the calendar. There is an advantage to collecting statistics for the jobs by defining a Dynamic Statistics definition related to a filtered list of jobs and adding the associated condition to the Condition Table for a period of time.

A list of periodic statistics definitions appear in the Periodic Statistics Manager. You must arrange the periodic statistics definitions in order of precedence, so that if a job is included in two or more periodic statistics definitions, the definition with the greater precedence (higher up on the list) is applied to the job. By default, new definitions are added to the bottom of the list as they are created. Since the order of the definitions is important, the list cannot be sorted.

NOTE:

• A statistics calendar that is defined in a z/OS job takes precedence over a Periodic Calendar that is related to the job through the Periodic Statistics Manager.
• Jobs can have one statistics definition only.

The following procedures describe how to view the latest statistics, copy, and delete a statistics definition:

• Analyzing active jobs:
• Creating a Periodic Calendar Statistics definition
• Creating a Dynamic Periodic Statistics definition
• Generating Dynamic Periodic Statistics
• Copying a Periodic Statistics definition
• Deleting a Periodic Statistics definition