Each field stores a value acquired from Performance Management or monitoring target program, or a value computed from such a value based on a certain computation formula. The acquisition destination or computation method for each field value is shown under the Data source column.

If performance data acquired from UNIX is processed and set as a field value, the character string in PFM - Agent for Platform's Data source column shows the computation method for the value that is set in the field. For example, for the value of the Avg Wait Time (AVG_WAIT_TIME) field of the Device Detail (PI_DEVD) record, the value obtained by dividing the value of the Total Wait Time (TOTAL_WAIT_TIME) field by the value of the Total I/O Ops (TOTAL_OPS) field is stored.

Two hyphens (--) indicate that performance data is not processed and set as a field value.

Data expressed as an amount of change is called a delta. For example, if the performance data collected during the first interval is 3 and that collected during the second interval is 4, 1 is stored as the amount of change. Whether each field value is a delta is indicated under the Delta column in the field table.

The performance data collected by PFM - Agent for Platform varies as shown in the table below.

Real-time reports for which Indicate delta value is selected^#, historical reports, and alarms

Record type	Delta	Data source	Is there any field that has delta = Yes in its data source column?	Value displayed or value evaluated through alarm monitoring
PI record type	Yes	No	--	Changed amount
		Yes	No	Changed amount in the result computed based on the value at the time of collection
			Yes	Result computed based on the changed amount
	No	No	--	Value at the time of collection
		Yes	No	Result computed based on the value at the time of collection
			Yes	Result computed based on the changed amount
PD record type	Yes	No	--	Changed amount. Accumulated value for a historical report or alarm of the Process Detail (PD) record
		Yes	No	--
			Yes	Result computed based on the changed amount. Result computed based on the accumulated value for a historical report or alarm of the Process Detail (PD) record
	No	No	--	Value at the time of collection
		Yes	No	Result computed based on the value at the time of collection
			Yes	Result computed based on the changed amount. Result computed based on the accumulated value for the Process Detail (PD) record
PL record type	No	No	--	Differing-components information for each collection interval

Legend:

--: Not applicable

#

Indicates whether the following items in PFM - Web Console are selected:

• Indicate delta value in the Indication settings (Realtime) window, which opens when Edit is chosen in the Report wizard
• Indicate delta value under Indication settings (Realtime) under the Properties tab in the Report window

Real-time reports for which Indicate delta value is not selected^#

Record type	Delta	Data source	Is there any field that has delta = Yes in its data source column?	Displayed value
PI record type	Yes	No	--	Accumulated value
		Yes	No	Result computed based on the value at the time of collection
			Yes	Result computed based on the accumulated value
	No	No	--	Value at the time of collection
		Yes	No	Result computed based on the value at the time of collection
			Yes	Result computed based on the accumulated value
PD record type	Yes	No	--	Accumulated value
		Yes	No	--
			Yes	Result computed based on the accumulated value
	No	No	--	Value at the time of collection
		Yes	No	Result computed based on the value at the time of collection
			Yes	Result computed based on the accumulated value
PL record type	No	No	--	Accumulated information since the service startup

Legend:

--: Not applicable

#

The following items in the dialog box in PFM - Web Console show whether Indicate delta value is selected:

• Indicate delta value in the Indication settings (Realtime) window, which opens when Edit is chosen in the Report wizard
• Indicate delta value under Indication settings (Realtime) under the Properties tab in the Report window

Example:

The Idle % field of the CPU - Per Processor Detail (PI_CPUP) record contains a PI-type record, and delta = No is set in this field. However, delta = Yes is set for the field indicated as the data source. Therefore, for real-time reports for which Indicate delta value is selected, historical reports, and alarms, a result computed based on the changed amount is displayed.

Note the following points about performance data collection:

• For a PI-type record to be saved, performance data must be collected at least twice.
  In each collection interval specified in PFM - Web Console, performance data is collected into a PI-type record. However, storing of performance data in the Store database is not executed at the point in time when performance data collection is specified in PFM - Web Console.
  
• The historical data of a PI-type record contains data that requires the difference from the previously collected data (for example, a delta value), and thus data from two collection intervals is required. Therefore, it may take as long as twice the specified time before the first historical data is stored in the Store database.
  For example, if the performance data collection interval is set to 300 seconds (5 minutes) at 18:32 in PFM - Web Console, the first data collection begins at 18:35. The next data collection begins at 18:40. Then, historical data is created based on the data collected at 18:35 and 18:40, and is stored in the Store database at 18:40.
  
• If Indicate delta value is selected for a real-time report, a value is displayed when the first data is collected. However, if the report needs the previous data, the first value is displayed as 0. When the second or subsequent data is collected, the collected data value is displayed.
• If the OS counter value wraps around because, for example, the system has been operating for a long time, the value of the Delta field might be extremely large.

Some averages and percentages in individual fields are determined as values on a second-by-second basis, while others are determined according to the data collection interval. Unless otherwise specified, the values determined according to the data collection interval are used (if the interval is 60 seconds, data is collected every minute).

Interval field values vary according to the record type as shown in the table below.

Table 8-6 Interval field values

Record type	Explanation
PI record type	Real-time reports If Indicate delta value is selected for a real-time report, the first value is 0. Thereafter, the value is the same as the refresh interval that is set in the report. The value is computed using the following formula: interval-field-value = record-time-field-value - record-time-field-value-obtained-during-previous-collection-interval If Indicate delta value is not selected for a real-time report, the value obtained by subtracting the system startup time from the current time is used. The value is computed using the following formula: interval-field-value = record-time-field-value - system-startup-time Historical reports The same value as the Collection Interval value. Computed using the following formula: interval-field-value = record-time-field-value - record-time-field-value-obtained-during-previous-collection-interval
PD record type	Always 0.
PL record type	Always 0.