About normal CSV file imports

Use the normal import mechanism if you primarily want to modify a small amount of existing data stored in the AVEVA Historian or store a small amount of new values. The insert of an entire CSV file results in a single new version of the data. If an inserted data point falls exactly on an existing timestamp, the data value is added to history. The existing data is maintained in history.

For guidelines on using this import method versus other import methods, see Guidelines for importing, inserting, and updating history data.