Database engine tuning advisor recommends a set of physical design structures that reduces the query optimizers estimated cost of the workload 数据库引擎优化顾问会推荐一组物理设计结构,以降低工作负荷的开销(由查询优化器估计)。
Perhaps by now some xslt processors have even more sophisticated optimizers that eliminate even this overhead, but i wouldn t count on such advancement yet 或许到目前为止某些xslt处理器甚至有更复杂的优化器,可以消除这一开销,但我还不指望这类先进技术。
Intrepid optimizers jack shirazi and kirk pepperdine, director and cto of javaperformancetuning . com, follow performance discussions all over the internet, expanding and clarifying the issues they encounter in this column 优化大师jackshirazi和kirkpepperdine,分别是javaperformancetuning.com的董事和cto,就他们本专栏中遇到的关于性能方面的问题,在internet上进行广泛的探讨和研究。
In this new column, intrepid optimizers jack shirazi and kirk pepperdine, director and cto of javaperformancetuning . com, follow performance discussions all over the internet, expanding and clarifying the issues they encounter 在这个新专栏中,无畏的优化大师jackshirazi和kirkpepperdine,分别是javaperformancetuning.com的董事和cto,他们在整个internet上推行性能大讨论,展开他们所碰到的问题并加以澄清。
We use a navigational algebra as the target ganguage the describes navigation plans and we show how to us rewrite rules in the spirit of relational optimizers and, taking link and inclusion constraints into account, to reduce the number of page accesses needed to answer a query 我们使用引导代数(navigationalalgebra)作为描述导航方案的目标语言,同时我们在研究最优化关系抽象中使用重写规则,将链接约束和包含约束引入到运算中,以便在回答查询中,减少大量需要访问的页面数量。
When used in multidisciplinary environment, csso has several advantages over standard optimization method : reduction of the information transfer; elimination of large iteration loop; allowance of the use of corresponding subspace optimizers in different disciplinary analysis; a parallel optimization architecture which is readily operable on a suite of heterogeneous equipments; more natural fit to the current organization structure found in most institutes of aerospace and aeronautic design; participation of the disciplinary experts to best deal with specific disciplinary models 当应用于多学科设计环境时,并行子空间优化方法相对传统优化方法有几大优点:减少了学科间信息传递的数量;免去了大的迭代循环;允许在不同学科分析模块中应用不同子空间优化器;可以在不同设备上并行运行;结构框架适用于传统学科组织形式;允许各学科专家最大限度地参与学科分析和设计。