The storage design of the OpenEdge RDBMS is divided into a physical model and a logical
model. You manipulate the physical storage model through ABL, OpenEdge SQL, and database
administration utility interfaces. The following figure shows how areas can be stored on and
span different file slices. Observe that although an area's extents are comprised of many disk
files, an extent can only be associated with one storage area.
Figure 1. Physical storage model
The logical storage model overlays the physical model. Logical database objects are described
in the database schema and include tables, indexes, and sequences that your application
manipulates. The following figure illustrates how logical objects can span physical extents.
Figure 2. Logical storage model
