Abstract

Introduction Handling large collections of digitized multimedia data, usually referred to as multimedia digital libraries, is a major challenge for information technology. The Mirror DBMS is a research database system that is developed to better understand the kind of data management that is required in the context of multimedia digital libraries (see also URL http://www.cs.utwente.nl/arjen/mmdb.html). Its main features are an integrated approach to both content management and (traditional) structured data management, and the implementation of an extensible objectoriented logical data model on a binary relational physical data model. The focus of this work is aimed at design for scalability. 2 Query processing The query facilities of the Mirror DBMS rely on the Moa Object Algebra [BWK98]. Moa constitutes an object data model and query algebra, designed to be used at the logical level of a DBMS. It

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