...为该应用使用Oracle数据库,首先想到了使用CBO来优化查询(原系统没有使用),CBO是基于代价的优化方式(Cost-Based Optimization),主要参照的是表及索引的统计信息,统计信息给出表的大小、有多少行、每行的长度等信息。
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... sql 优化 两种的优化方式,即: 基于规则的优化方式(Rule-Based Optimization,RBO) 基于代价的优化方式(Cost-Based Optimization,CBO) RBO方式:优化器..
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cost-based query optimization 成本为基的查询最佳化
The optimizer considers star join optimization when appropriate and decides on star join plan based on cost considerations in order to come up with best execution plan for a star join query.
为了实现星型连接查询的最佳执行计划,优化器在适当的时候会考虑星型连接优化,并根据成本因素来决定星型连接计划。
The traditional optimization design is only based on the minimum cost objective function and does not consider the mechanical analysis target.
传统的优化设计仅以最低造价为目标函数,没有考虑结构的受力性能指标。
So, it is not a thing with misty nihility to that tax cost optimization research based on it, on the contrary, it has more realistic significance.
因此,基于信息技术的税收成本优化研究并不是一个虚无飘渺的东西,相反,则是非常具有现实意义的。
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