Before compression

The following questions need to be considered before setting the archive parameters:

• What values are you dealing with?

• Which ones are relevant for archival?

• Which functions (for example, mean, minimum, maximum) are essential for compression?

• Are hourly or daily averages sufficient in some cases (compression over the same intervals)?

• When composing data points, consider the following aspects to ensure reasonable data management: Dynamics (for instance all DPEs in an archive change at the same rate), logical association, necessary availability in the system.

• Create your archives accordingly. You can either do that in advance (see History DB) or create them directly from the Compression configuration panel.

• If necessary carry out a file changeover in the archive records to enable your inputs.

• Do not forget to start the relevant WCCOAvalarch for each archive.

The archives used in compression configuration should already have been created with the correct parameters and started prior to use.