This work discusses the CROQUE approach to the maintenance problem for materialized views. In a CROQUE database, application-speci ed collections (type extents or classes) themselves need not be materialized. In exchange, the system maintains (redundant) views of the application data that help to minimize query response time. We understand views as functions of database objects and examine algebraic properties of these functions, in particular linearity, t o d e r i v e incremental update plans. It turns out that it is feasible to employ ODMG OQL as a view de nition language { instead of inventing a specialized one { in such a n e n vironment, since the majority of its clauses represent linear functions.
In this article, we will discuss a flexible, convenient implementation scheme for interactive evaluations of tabular information. In this scheme, an iterator represents the result of a query. This iterator is constructed from a couple of polymolrphic building blocks, which correspond to the basic features of the query language.
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