...是,只有底层的算法和源代码被很好保护(即使在微软内部),优化器如何工作才能被研究和监视。 这个所谓的基于成本(cost-based)的优化器,意味要去评估执行查询的各种方式,然后选择被认为拥有最小成本的方式去执行。
基于50个网页-相关网页
MySQL查询优化器是基于代价(cost-based)的查询方式。因此,在查询过程中,最重要的一部分是根据查询的SQL语句,依据多种索引,计算查询需要的代价,从而选择最优的索引方...
基于48个网页-相关网页
Cost-Based Optimizer 基于代价的优化器 ; 基于开销的优化器 ; 基于成本的优化
Cost-Based Optimization 基于代价的优化方式
cost-based method 成本分析法
Cost-based Price 很平庸的成本订价
cost-based budgets 按成本编制预算
cost-based budgeting 按成本编制预算
cost-based transfer prices 成本基础转拨计价法
Quality and Cost-Based Selection 质量和费用的评审方法
After categorizing all related theories and methods into three classes (compensation principle, cost-based principle, and others), the conclusion was that there are no theories or methods on interconnection charges that can satisfactorily resolve the issue so far.
论文把它们归纳为补偿原则、成本原则和其他网间结算方法三种类型,分别对其特点和缺陷进行了深入的分析。 分析的结果表明,目前国内外还没有一种能够在理论和实践上完全解决网间结算问题的方法。
参考来源 - 电信业务网间结算研究·2,447,543篇论文数据,部分数据来源于NoteExpress
Only after establishing a set of desirable location options should companies refine choices using cost-based factors.
只有在建立了一套理想的地点选择之后,公司才应该使用基于成本的因素来完善选择。
A cost-based index ORing (RIDSCN) plan.
一个基于成本的索引oring (RIDSCN)计划。
Since its inception in 1990, TV Marti has been the subject of controversy over cost, contracting,internal management and journalistic issues, and the inability of the Miami-based station to reach enough of the population in Cuba to justify the $500 million spent on the operation so far.
VOA: standard.2009.06.18
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