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User's Guide
The columns in each table correspond to the data items in the
corresponding playback view. The columns are arranged in the order in
which the data items were listed when you defined the playback view. See
Table B-3 on page 148 to determine the datatype of each column.
Each row represents a different combination of key data items in the view.
If the view contains no key data items, then the table returns a single row
reflecting server-level data.
When there is no activity to report, some views return a row with zero
values and other views omit the row. The rules controlling whether or not
a row with zero values appears in a view are:
•
Views with server-level data items always return a row, even when
there is no activity to report.
•
Views that contain the key data items Process ID, Object ID, or
Procedure ID omit the row when there is no activity to report. See
"Views with Process ID" on page 81 for more explanation about
when a Process ID is returned.
•
Views that contain keys other than those listed in the previous item
return rows even when there is no activity.
If playback is summarizing data, a row is returned for a combination of
keys if any sample in any of the input sessions contains the same
combination of keys.
If an integer data item overflows, Historical Server returns the largest valid
number in the data item, and returns an information message to the client.
Views with Process ID
When a server process terminates, Adaptive Server can reuse its Process
ID for a new process. Therefore, the Process ID data item is not guaranteed
to uniquely identify a process. The Kernel Process ID data item, however,
uniquely identifies a process.
Views that include Process ID return rows as follows:
•
Recording session views (and hence, raw playback views) return a
row only for Process IDs representing processes that exist at the end
of a sample interval. If a server process terminates in the middle of a
sample interval, a row is not returned for its Process ID.
CHAPTER 4
Command Reference
81
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