Use OPC HDA Server Enterprise to access your historian data!
Integration Objects’ OPC HDA Server Enterprise is an OPC-compliant Server that provides OPC HDA Clients with full access to data archived in the supported databases. OPC HDA Clients will be able to read and update data from/to ADO-compliant databases. For example, these databases include Oracle, Microsoft SQL Server, Wonderware Historian, and Microsoft Access.
Consequently, you can have all of your historical process data at your fingertips within a few clicks.