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In this paper, we introduce structural join index hierarchy (SJIH) mechanisms that mimic the class composition hierarchy of the complex objects to provide direct access to complex objects and/or their component objects. SJIH extends the work on join index hier- archies by providing efficient and flexible access to complex objects, thus unifying various previous indexing methods proposed for object oriented database ( OODB). A cost model for processing the queries and maintaining the indices is developed. A heuristic algorithm is designed to select appropriate indices to efficiently process a given set of queries. We show that SJIH indexing mech- anisms facilitate efficient retrieval of complex objects. Given a set of queries and a limited index storage space, the heuristic algo- rithm facilitates fast selection of near-optimal set of indices for efficiently executing the queries.

Complex object retrieval via structural join index hierarchy mechanisms