History blocks: a SQL server remote data source

History blocks are remote data sources used by AVEVA Historian. That is, they are data repositories that exist outside of a SQL Server database file (.MDF). Microsoft sometimes refers to these types of data sources as "non-local data stores."

All tag data is stored in history blocks. For more information on history blocks, see Manage partitions and history blocks in the AVEVA Historian Administration Guide.

OLE DB technology can be used to access data in any remote data store. This access is accomplished though a software component called an OLE DB provider.