Historical data collection

OMEGAMON® for Storage on z/OS® provides both short-term and long-term historical data collection. It is important to distinguish between the two when collecting data.

See:

• Short-term historical data
• Long-term historical data

After you activate historical data collection, an icon is displayed in qualifying views in IBM® Enterprise Portal workspaces. To produce meaningful reports, you must wait until sufficient historical data is collected and stored. You can click the icon to extend any existing IBM Enterprise Portal view (also called a report) to include historical data. IBM Enterprise Portal reports automatically pull data from short-term and long-term history based upon the time period that you specify for the report.

You can configure different collection intervals for historical and real-time data. To avoid excessive demand on processor resources and to decrease storage consumption, historical data collection is typically performed less frequently than real-time data collection. You can configure a short-term historical data collection interval of 5, 15, 30, or 60 minutes.

Writing data to long-term history can be configured for 24 hours or 1 hour, or you can turn it off. If you configure long-term history, select a warehousing interval of 1 hour to avoid transferring 24 hours worth of historical data at one time. Shorter intervals reduce the duration of processor usage associated with writing data to the warehouse by distributing the writing of data across 24 time periods.