Title

On Decompositions of Chain Datalog Programs into P (Left-)Linear 1-Rule Components

Document Type

Article

Publication Date

6-1995

Abstract

As an approach to optimization, this paper examines the decomposition of chain Datalog programs into P(left-)linear sequences of 1-rule programs. The notion of P (left-)linear, introduced here, encompasses numerous special (left-) linear forms and includes the traditional (left) linear as a subcase. The decompositions are first characterized in terms of properties of associated context-free languages. More specific characterizations are provided for three types of P (left-)linear decompositions with 1-rule components, and the corresponding decision problems considered. Finally, arbitrarily large, inherently nondecomposable, P-linear size-prime programs are exhibited.

DOI

10.1016/0743-1066(94)00027-4

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