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Viewing performance over different periods

VistaPoint, and the products that work with it, displays current data from three different data-collection periods: real time, interval, and session. Each period combines performance data collected over distinct time intervals. VistaPoint, and the products that work with it, provides a set of views that show the performance of monitored values over these time periods.

This section discusses real time, interval, and session views. Tables list the views of VistaPoint and the products that work with it for each data-collection period. A separate section discusses how to display historical data in VistaPoint or other product views.

The following figure shows an example of a performance parameter that is monitored over time. At any instant, the value of the monitored parameter depends on the sampling rate and whether its data represents a count, an average, a rate, or condition.

BMC AMI Ops Data Collection Periods 

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The top shows real-time, interval, and session data-collection periods. As expected, the real-time data-collection period presents data monitored over the most recent period, typically the last 60 to 90 seconds. An interval data-collection period represents collection over a longer period of time, typically up to 15 minutes. A session data-collection period represents data collected over the entire span of time that a value is monitored.

The horizontal lines represent the average values over the data-collection periods. Notice the difference between real-time, interval, and session averages. Each data-collection period summarizes the performance of the monitored value within that time frame. Figure shows how cluster views can be used to get an overview of performance across all three periods from a single view.

Warning

Note

The actual duration for the interval collection period is determined by the IRRI parameter in BBIISP00. The default value is 15 minutes. The data is reset every 15 minutes on the quarter-hour. BBIISP00 is located in the BBPARM PDS. The duration period for real time data collection is equal to the IRRI value divided by 10. By default, then, it equals 1.5 minutes. Session data is reset every twenty-four hours at midnight.

Normally, you shift between views that display data collected over different time periods when you need to see the performance of your applications or workloads from a different perspective. If you want to see the current performance of a workload or application, real-time views present data that represents near instantaneous performance. Interval views represent data collected over the near-term, typically 15 minutes. Session views give you the entire breadth of performance, representing all performance data collected since monitoring began. The length of a session depends on the time range specified to monitor the performance parameter.

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MainView VistaPoint 1.1