准确的索引信息和统计信息是查询优化器中基于成本的决策的基础。
Accurate index information and statistics are fundamental to cost-based decisions in the query optimizer.
优化器可能会以一种基于成本的方式将更多索引加入到 IXAND 计划中。
The optimizer may add more indexes to the IXAND plan in a cost-based fashion.
DB 2 UD b中包含了一个功能强大基于成本的查询优化器，用于确定访问数据的最佳策略。
DB2 UDB comes with a powerful cost-based query optimizer that determines the best strategy to access data.
应用推荐