Refresh Rate |
Specifies how frequently TPV collects performance data for a server
from the Performance Monitoring Infrastructure (PMI) service provided by that
server. The default is 30 seconds. To collect performance data for the
server more frequently, set the refresh rate to a smaller number. To collect
performance data less frequently, set the refresh rate to a larger number.
The allowed range is 5 to 500 seconds.
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Buffer Size |
Specifies the number of entries to be stored for a server. Data displayed
in TPV is stored in a short in-memory buffer. After the buffer is full, each
time a new entry is retrieved the oldest entry is discarded. The default buffer
size is 40 entries. Supported values are 10, 20, 30, 40, 50, 60, 70, 80, 90
and 100. The larger the buffer size, the more memory is consumed. Thus, specify
a buffer size that allows you capture enough monitoring data for analysis
without wasting memory storing unneeded data. |
View Data As |
Specifies how counter values are displayed. Viewing options include
the following:
- Raw Value
- Displays the absolute value. If the counter represents load data, such
as the average number of connections in a database pool, then TPV displays
the current value followed by the average. For example, 18 (avg:5).
- Change in Value
- Displays the change in the current value from the previous value.
- Rate of Change
- Displays the ratio change/(T1 - T2), where change is the
change in the current value from the previous value, T1 is the time
when the current value was retrieved, and T2 is the time when the previous
value was retrieved.
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The refresh rate and buffer size settings combine to control
how much temporal history you have for the application server. The default
values for Refresh Rate (30 seconds) and Buffer Size (40 entries)
provide you with a 20-minute history of the application server’s performance.
Changing one of these parameters affects the length of the temporal history.