Used to perform additional query to get record count for this SELECT, so the RecordCount property reflects the actual number of records.
property QueryRecCount: boolean;
If True, and the TCustomMSDataSet.FetchAll property is False or the NonBlocking option is True, TCustomDADataSet performs additional query to get record count for this SELECT, so the RecordCount property reflects the actual number of records. Does not have any effect if the FetchAll property is True and the NonBlocking option is False.