This paper is one of a series of papers that define specific aspects or components of the OpenEdge Reference Architecture (OERA).Â This paper defines the Data Sources layer, discusses why the Data Sources layer is a valuable concept, its dependencies and some of the key design decisions and consequences to consider.
Data Sources: Definition
The Data Sources layer represents the places where application data is stored and retrieved and contains physical data source components.
The components of the Data Sources layer can be split into two categories, Managed and Un-Managed.
A Managed Data Source is a data source managed by the OpenEdge RDBMS or an OpenEdge DataServer product. For example an OpenEdge Database or an Oracle Database connected via the OpenEdge Oracle DataServer.
An Un-Managed Data Source is a data source not managed by the OpenEdge RDBMS or an OpenEdge DataServer product. For example text files stored on disk, or a Ticker Feed or an XML file