Titlebook: Index Data Structures in Object-Oriented Databases; Thomas A. Mueck,Martin L. Polaschek Book 1997 Springer Science+Business Media New York

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,Performance Analysis — An Example,formance of the MT-index (see Section 4.4), the CH-index (see Section 4.3.1), and the H-tree (see Section 4.2.2) are compared. As usual there is no dominating approach for all hierarchy structures and query profiles, however, we are able to provide a few rules of thumb for index selection.

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Type Hierarchy Indexing,type or, implicitly, to a subhierarchy and therefore to a set of types. In this chapter, the specific requirements, the technical issues, and some selected data structure solutions in the context of type hierarchy queries are discussed.

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Aggregation Path Indexing,query involving more than one table usually contains explicit joins. For example let us assume a query involving Staff and Department, in particular, the retrieval of the names of staff persons working in the Process Automation department. Comparing the SQL-style query

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,Performance Analysis — An Example,formance of the MT-index (see Section 4.4), the CH-index (see Section 4.3.1), and the H-tree (see Section 4.2.2) are compared. As usual there is no dominating approach for all hierarchy structures and query profiles, however, we are able to provide a few rules of thumb for index selection.

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