文章基本信息

标题：Querying XML in Timber
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作者：Yuqing Wu ; Stelios Paparizos ; H. V. Jagadish 等
期刊名称：Bulletin of the Technical Committee on Data Engineering
出版年度：2008
卷号：31
期号：04
页码：15-15
出版社：IEEE Computer Society
摘要：In this paper, we describe the TIMBER XML database system implemented at University of Michigan. TIMBER was one of the first native XML database systems, designed from the ground up to store and query semi-structured data. A distinctive principle of TIMBER is its algebraic underpinning. Central contributions of the TIMBER project include: (1) tree algebras that capture the structural nature of XML queries; (2) the stack-based family of algorithms to evaluate structural joins; (3) new rule-based query optimization techniques that take care of the heterogeneous nature of the intermediate results and take the schema information into consideration; (4) cost-based query optimization techniques and summary structures for result cardinality estimation; and (5) a family of structural indices for more efficient query evaluation. In this paper, we describe not only the architecture of TIMBER, its storage model, and engineering choices we made, but also present in hindsight, our retrospective on what went well and not so well with our design and engineering choices.