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Dynamic Constraints Derivation and Maintenance in the Teradata RDBMS

机译:Teradata RDBMS中的动态约束派生和维护

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We define a new algorithm that allows the Teradata query optimizer to automatically derive and maintain constraints between date type columns across tables that are related by referential integrity constraints. We provide a novel, quantitative measure of the usefulness of such rules. We show how the Teradata query optimizer utilizes these constraints in producing more optimal plans especially for databases that have tables that are value ordered by date. We also discuss our design for maintaining these constraints in the presence of inserts, deletes, and updates to the relevant tables. Finally, we give performance numbers for seven TPC-H queries from our prototype implementation based on the Teradata Database engine.
机译:我们定义了一种新的算法,允许Teradata查询优化器在通过引用完整性约束相关的表中自动导出和维护日期类型列之间的约束。我们提供了一种小说,定量衡量这些规则的有用性。我们展示了Teradata查询优化器如何利用这些约束,在产生更多最佳计划时,特别是对于具有按日期订购的值的数据库。我们还讨论了我们的设计,用于在存在于相关表的插入,删除和更新的情况下维护这些约束。最后,我们根据Teradata数据库引擎提供来自我们的原型实现的七个TPC-H查询的性能编号。

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