Sybase 12.5.1 User Manual page 20

Adaptive Server Enterprise Monitor architecture
Data items and statistic types
6
When you define a recording session, you define one or more views to be
included in that recording session. A recording session must have at least one
view. For more information about creating recording session views, see
hs_create_view on page 72
Appendix D, "Examples of Recording Session Views" contains many sample
recording session views.
When you define a playback session, you define which views in the previously
defined recording sessions should be included in the playback session. The
playback session view names must be the same as the names used for the
recording sessions views. You can include all data items or a subset of the data
items from the recording session view in the corresponding playback view. For
more information about creating playback views, see
.
on page 67
A data item identifies specific information that you want to include in the
view. If a data item includes embedded spaces, you must surround the name
with quotation marks when you use it. Some sample data items are: Page I/O,
Login Name, and CPU Time.
Table A-1 on page 103 lists all available data items and describes each one.
Each data item has a statistic type associated with it. The statistic type defines
the duration of the data item (sample or session) and whether Historical Server
performs calculations on the data item.
The statistic types contain embedded spaces. You must surround them with
quotation marks when you use them in the Historical Server commands.
Not all statistic types are valid with all of the data items. Table B-3 on page 148
shows valid statistic types for each data item.
The six statistic types are:
•
"Value for Sample"
type of information that applies to the most recent sample interval. It
implies no calculations.
• Activity Counts – for data items that represent activity counts, this
statistic type returns the number of occurrences of an activity during
the most recent sample interval. For example, Value for Sample for
Page I/O is the number of page I/Os that occurred during the most
recent sample interval.
.
– this statistic type returns a count of activity or some
hs_create_playback_view
Historical Server