Performance data collection
Performance data represents a majority of the data collected by the PingDataMetrics server.
Each server can produce hundreds of kilobytes of performance data per minute, though the amount of data captured has little to no impact on the performance of the monitored system. By default, the PingDataMetrics server stores performance data for 20 years. Configure the volume of performance data collected by each monitored server so that the PingDataMetrics server can keep up with the flow.
The performance data model is a dimensional data model. Measurements can be taken on multiple simultaneous values that are distinguished by dimension values. For example, a response time metric provides the time in milliseconds it took a server to respond to an LDAP request. This response-time metric has two dimensions:
- Application name
-
Reflects the connection criteria of the request.
- Operation type
-
Corresponds to the LDAP operation, such as add, bind, or search. If a server has 20 different connection criteria, each response-time sample can have 140 different values, one for each of the applications multiplied by the number of operation types.
The performance data captured on the monitored server has a record with the following fields.
| Name | Data type | Description |
|---|---|---|
Timestamp |
Date |
Time of measurement, using clock on the monitored server |
Metric |
String |
Name of metric |
Dimension |
String |
Values of dimensions 1 - 3 |
Count |
Int |
Number of measurements represented by this sample |
Average |
Double |
Average value of this sample |
Minimum |
Double |
Optional minimum value of this sample |
Maximum |
Double |
Optional maximum value of this sample |
Buckets |
Int |
Optional histogram data associated with this sample |
When a performance record is imported into the PingDataMetrics server, it is normalized to reduce the size of the record. The normalized record contains the following information.
| Name | Data type | Description |
|---|---|---|
|
Int |
The ID of the batch of data to which this record belongs |
|
Timestamp |
The time the sample was captured or equivalent information after aggregation |
|
Int |
The ID of a structure that reflects the metric and all dimension values |
|
Int |
ID of the histogram definition, if the data belong to a histogram-valued sample |
|
Int |
Number of measurements represented by this sample |
|
Real |
Average value for this sample |
|
Real |
Minimum value for this sample |
|
Real |
Maximum value for this sample |
|
Long |
Histogram bucket values |