Abstract

This paper proposes an index structure:Path Navigation Index(PNI),which can reduce the cost of evaluating path expression,leading to efficient query processing of cross-class query and deputy object query in object deputy database.Path Navigation Index consists of Path-Instance-Table,Identity-Index and Attribute-Index.Path instances are materialized in Path-Instance-Table,avoiding redundant object traversal in query processing.Identity-Index and Attribute-Index facilitate associative search of path instances,avoiding predicate evaluation during object traversal.The experiments are used to analyze the influential factors of path expression evaluation,and the experimental results demonstrate that evaluation of path expression with this index outperforms the other methods in most cases,especially for the path expressions with predicate conditions.

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