Ludwig-Maximilians-Universität München, Institut für Informatik
Technical Report 93-07
- TITLE:
-
Integration of Relational Databases in a Multidatabase System based on Schema Enrichment
- DATE:
-
April 1993
- AUTHORS:
- Daniel A. Keim
- Hans-Peter Kriegel
- Andreas Miethsam
- Institut für Informatik
- Universität München
- Leopoldstr. 11B
- D-80802 München (Germany)
- KEYWORDS:
-
interoperability of database systems, federated databases, multidatabase
systems, schema enrichment, schema transformation, translation of operations,
object-oriented database systems, object-oriented database query language
- ABSTRACT:
-
In this paper, we describe a framework for an object-oriented modeling
of meta information and its use for the integration of heterogeneous
databases with the goal of their interoperation. The meta information
consists of all types of information necessary to access and interoperate the
participating databases. As part of the meta information, we model the
common properties and differences of the various data models and concrete
systems. Additionally, we also include information to semantically
enhance the schemas of the participating databases providing the basis
for a (semi-)automatic schema transformation. We describe the semantic
enrichment of a relational schema using additional information deduced
from its underlying entity-relationship design schema. The
enhanced relational schemas may be automatically transformed into
corresponding schemas in the common data model which in our case is
the object-oriented model. Queries using the created object-oriented
schema may be automatically translated into equivalent SQL queries for
the original relational schema.
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Robert Stabl
(28.11.1994)