Creating specialised integrity checks through partial evaluation of meta-interpreters

Abstract

Integrity constraints are useful for the specification of deductive databases, as well as for inductive and abductive logic programs. Verifying integrity constraints upon updates is a major efficiency bottleneck and specialised methods have been developed to speedup this task. They can, however, still incur a considerable overhead. In this paper we propose a solution to this problem by using partial evaluation to pre-compile the integrity checking for certain update patterns. The idea being, that a lot of the integrity checking can already be performed given an update pattern without knowing the actual, concrete update. In order to achieve the pre-compilation, we write the specialised integrity checking as a meta-interpreter in logic programming. This meta-interpreter incorporates the knowledge that the integrity constraints were not violated prior to a given update. By partially evaluating this meta-interpreter for certain transaction patterns, using a partial evaluation technique presented in earlier work, we are able to automatically obtain very efficient specialised update procedures, executing faster than other integrity checking procedures proposed in the literature.