摘要： 对数据库系统内长期运行的查询处理的查询优化提出了一种触发的动态查询再优化方法。对这种动态再优化机制的动态评价方法、原则以及查询计划的重构进行了说明，着重讨论了触发动态再优化的触发机制和查询处理。

关键词: 并行查询, 动态优化, 触发器

Abstract: This paper proposes a triggered dynamic query re-optimization for very long-running queries in database systems. It describes the run-time evaluation and query plan reconfiguration, then discusses with emphasis the triggering mechanisms and query processing of the triggered dynamic re-optimization.

中图分类号: 

• TP311.52