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Recently developed inferential database systems face some common problems: a very fast growth of search space and difficulties in recognizing inference termination (especially for recursive axioms). These shortcomings stem mainly from the fact that the inference process is usually separated from...
A state transition model for the optimization of query processing in a distributed database system is presented. The problem is parameterized by means of a state describing the amount of processing that has been performed at each site where the database is located. A state transition occurs each...
We study algorithms for computing the equijoin of two relations in a system with a standard architecture hut with large amounts of main memory. Our algorithms are especially efficient when the main memory available is a significant fraction of the size of one of the relations to he joined; but...
This paper addresses the problem of optimizing queries that involve set operations (set queries) in a distributed relational database system. A particular emphasis is put on the optimization of such queries in horizontally partitioned database systems. A mathematical programming model of the set...
An extension to the relational model is described in which domains can he arbitrarily defined as abstract data types. Operations on these data types include primitive operations, aggregates, and transformations. It is shown that these operations make the query language complete in the sense of...
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