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User's Guide
•
Other information – this is the only statistic type valid for data items
that represent character strings. For example, Value for Sample for
Object Name returns the name of a table. This statistic type is also the
only one valid for data items that represent values such as IDs and
values for configured parameters, such as Process ID and Code
Memory Size.
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"Value for Session"
activity since the start of gathering the data (since the connection was
opened). No calculations are performed. For example, Value for Session
for Page I/O is the number of page I/Os that occurred since the recording
session started.
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"Rate for Sample"
the average number of occurrences per second of an activity during the
most recent sample interval. For example, Rate for Sample for Page I/O is
the average number of page I/Os that occurred each second during the
most recent sample interval.
The calculation is:
Count for the most recent sample interval
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Number of seconds in the sample interval
•
"Rate for Session"
the average number of occurrences per second of an activity during the
current recording session. For example, Rate for Session for Page I/O is
the average number of page I/Os that occurred per second since the
recording session started.
The calculation is:
•
"Average for Sample"
occurrence of an activity over the most recent sample interval. Only a few
data items can use this statistic type. The meaning of the returned value
depends on the data item. For example, Average for Sample for Procedure
Elapsed Time is the average execution time per execution of a stored
procedure during the most recent sample interval.
– this statistic type returns a cumulative count of
– this statistic type calculates a rate per second. It returns
– this statistic type calculates a rate per second. It returns
Count for the session
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Number of seconds in the session
– this statistic type calculates an average value per
CHAPTER 1
Introduction
7
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