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| Content Provider | Springer Nature Link |
|---|---|
| Author | Josifovski, Vanja Risch, Tore |
| Copyright Year | 1999 |
| Abstract | AMOS is a mediator system that supports passive (non-intrusive) integration of data from heterogeneous and autonomous data sources. It is based on a functional data model and a declarative functional query language AMOSQL. Foreign data sources, e.g., relational databases, text files, or other types of data sources can be wrapped with AMOS mediators, making them accessible through AMOSQL. AMOS mediators can communicate among each other through the multi-database constructs of AMOSQL that allow definition of functional queries and OO views accessing other AMOS servers. The integrated views can contain both functions and types derived from the data sources. Furthermore, local data associated with these view definitions may be stored in the mediator database. This paper describes AMOS' multi-database query facilities and their optimization techniques. Calculus-based function transformations are used to generate minimal query expressions before the query decomposition and cost-based algebraic optimization steps take place. Object identifier (OID) generation is used for correctly representing derived objects in the mediators. A selective OID generation mechanism avoids overhead by generating in the mediator OIDs only for those derived objects that are either needed during the processing of a query or have associated local data in the mediator database. The validity of the derived objects that are assigned OIDs and the completeness of queries to the views are guaranteed by system generated predicates added to the queries. |
| Starting Page | 165 |
| Ending Page | 190 |
| Page Count | 26 |
| File Format | |
| ISSN | 09259902 |
| Journal | Journal of Intelligent Information Systems |
| Volume Number | 12 |
| Issue Number | 2-3 |
| e-ISSN | 15737675 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 1999-01-01 |
| Publisher Place | Boston |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Data Structures, Cryptology and Information Theory Artificial Intelligence (incl. Robotics) Document Preparation and Text Processing Business Information Systems |
| Content Type | Text |
| Resource Type | Article |
| Subject | Artificial Intelligence Computer Networks and Communications Information Systems Software Hardware and Architecture |
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