Use OPC Server Enterprise to access your historian data via OPC!
Integration Objects’ OPC Server Enterprise is a plug and play OPC server software. It provides OPC DA and HDA Clients with full access to both real-time and archived data collected from database systems. Using ADO technology, OPC Clients will be able to read and update data from/to several databases. For example, the supported databases include Oracle, Microsoft SQL Server, Wonderware Historian and Microsoft Access.
With this level of connectivity, you can have all of your real-time and historical process data at your fingertips. Then, you will be able to easily process and analyze your data.