The expressiveness of first-order queries makes first-order query rewriting based on database repair has more practical value on solving CQA problem over inconsistent database compared with other methods.However

the execution efficiency of consistent query rewriting generated from the existing methods might be unsatisfactory.How to effectively promote the performance of consistent query in the data integration environment is studied principally in this paper.Facing the same conjunctive query class

C

forest

the consistent query rewriting algorithm ConsRewrite_OR based on OR-database integration schema is presented.Both query cost analysis based on the linear work metric and TPC-H simulated experiments on Oracle 10g a

dequately indicate that the consistent query rewriting produced by ConsRewrite_OR can obtain more optimized execution efficiency on integration databases

compared with Fuxman's consistent query rewriting.