CA SystemEDGE User Guide › History Collection › History Control Table and History Data Table

History Control Table and History Data Table

The History Control table contains parameters that describe the data that the agent will sample and store in the History table. Each row of the History Control table assigns values to the parameters (columnar objects) of the table and thereby defines a specific data collection function. One or more rows (stored samples) in the History table are associated with that single control row.

Each control table row is assigned a unique value of empireHistoryCtrlIndex. A row defines the data collection function by specifying the object instance to be sampled, how often to sample (in multiples of 30 seconds), and the number of samples to keep (buckets). Associated with each data collection function (row of the control table) is a set of rows of the History table. Each row of the History table, which is also named a bucket, holds the value of the specified MIB object that was gathered during one sampling interval.

As each sampling interval occurs, the agent adds a new row to the History table with the same empireHistoryIndex as the other rows for this data collection function. Each new row corresponds to the single row in the History Control table, and has an empireHistorySampleIndex that is one greater than the SampleIndex of the previous sample.