Datalog and Recursive Query Processing (2012)


In recent years, we have witnessed a revival of the use of recursive queries in a variety of emerging application domains such as data in- tegration and exchange, information extraction, networking, and pro- gram analysis. A popular language used for expressing these queries is Datalog. This paper surveys for a general audience the Datalog lan- guage, recursive query processing, and optimization techniques. This survey differs from prior surveys written in the eighties and nineties in its comprehensiveness of topics, its coverage of recent developments and applications, and its emphasis on features and techniques beyond “classical” Datalog which are vital for practical applications. Specifi- cally, the topics covered include the core Datalog language and various extensions, semantics, query optimizations, magic-sets optimizations, incremental view maintenance, aggregates, negation, and types. We conclude the paper with a survey of recent systems and applications that use Datalog and recursive queries.

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