When retrieving data from Historian, you specify either a raw or non-raw sampling mode. Non-raw retrieval can include a calculation mode so that calculations are performed in the archiver before data is returned. This is detailed in the following sections:

  • Sampling Modes
  • Hybrid Modes
  • Filtered Data Queries

Some sampling and calculation modes are better suited to retrieving compressed data. Understanding the available modes helps you choose the best method for your archiving process.

The retrieval topics include descriptions of all methods of retrieval:
  • API
  • SDK
  • OLE DB
  • Charting
  • Reporting via OLE DB and Excel Add In