| Description | An entry in this table. Each entry corresponds to a data
group. A data group is used to select data that needs to be
collected into VFiles. The selection is done by specifying
the base objects and their instances for which the values
need to be fetched.
Data is collected only for those data groups, that have
the corresponding instance of cdcDGRowStatus set to
'active'.
In order for data to be collected, each data group has to
be associated with a cdcVFileEntry (see cdcDGVFileIndex). If
the data collection mode of the associated cdcVFileEntry is
automatic, then data is fetched and stored into the current
VFile of the associated cdcVFileEntry at periodic
intervals (cdcDGPollPeriod). |