Sciweavers

EDBT
2002
ACM

Incremental Maintenance of Schema-Restructuring Views

14 years 3 months ago
Incremental Maintenance of Schema-Restructuring Views
An important issue in data integration is the integration of semantically equivalent but schematically heterogeneous data sources. Declarative mechanisms supporting powerful source restructuring for such databases have been proposed in the literature, such as the SQL extension SchemaSQL. However, the issue of incremental maintenance of views defined in such languages remains an open problem. We present an incremental view maintenance algorithm for schema-restructuring views. Our algorithm transforms a source update into an incremental view update, by propagating updates through the operators of a SchemaSQL algebra tree. We observe that schema-restructuring view maintenance requires transformation of data into schema changes and vice versa. Our maintenance algorithm handles any combination of data updates or schema changes and produces a correct sequence of data updates, schema changes, or both as output. In experiments performed on our prototype implementation, we find that incremental...
Andreas Koeller, Elke A. Rundensteiner
Added 08 Dec 2009
Updated 08 Dec 2009
Type Conference
Year 2002
Where EDBT
Authors Andreas Koeller, Elke A. Rundensteiner
Comments (0)