查询词典 a priori bound

In this paper it analyzes the execution process of SQL statement in Oracle database and finds out that reducing times of SQL statement parsing and optimizing CBO are the emphases of SQL performance tuning.Then it validates the key role of using bound variable and cache cursor in enhancing performance of SQL with example.

从分析ORACLE数据库中SQL语句执行原理入手，指出减少SQL语句的解析次数和优化CBO是SQL性能优化的重点，并用实例验证了使用绑定变量和高速缓存游标在提高SQL性能方面的重要作用。

The scope of a variable bound in a for or let clause comprises all subexpressions of the containing FLWOR expression that appear after the variable binding.

for子句或者let子句中变量绑定的作用域，包括所属FLWOR表达式中变量绑定后的所有子表达式。

Let $1 :="string"} If you explicitly say 如果你明确地说{$1 :="string"} the variable is not bound hypothetically, so $1 persists as long as the current match object persists, even if this closure is backtracked over.

那么变量没有假设的绑定，所以$1变量将会和当前的匹配生命期一样长，尽管这个闭合是返退过的。

He is bound up in his work.

他埋头于他的工作。

He is bound up in his research work.

他专心于自己的研究工作。

Under some suitable assumptions, a global error bound for the solution to the second-order cone complementarity problem is established and the level of every merit function is bounded based on these merit functions.

在某些条件下，基于这类效益函数建立了二阶锥互补问题解的一个全局误差界及这类函数的水平有界性。

Based on the delta operator bounded real lemma, sufficient condition with an H〓 norm bound on closed loop uncertain systems and state feedback design are provided.

基于Delta算子的界实引理，给出了闭环不确定系统具有H〓范数界的充分条件及状态反馈设计方法。

Considering the uncertainties of peak acceleration and frequency characteristics by using a bounded convex set model,the bounds of shear forces are derived from the Chinese seismic code,and then a new lateral bound load method for pushover analysis is proposed.

动力弹塑性时程分析法是一种较理想的结构抗震性能评估方法，但由于地震动的选取对其结果影响较为显著，而且目前尚无关于地震动选取的统一标准，从而严重地阻碍了动力弹塑性时程分析法的应用。

However , eyes think that their field is bound and mind is the greatest . Mind flashes boundlessly far away .

可是眼睛认为自己的范围还是有限，不像心，念头一转，就海阔天空，无远弗届。

The germination, expansion and reciprocity of the crack inside the material embody on the crystal bound of the material. So, in this study we can change the bourgeon and extend condition of the tiny crack inside the material by design and control the crystal interface structure effectively and provide new research approach for the design and manufacture of the machinability ceramic.

由于材料的破坏和加工都决定于材料内部微裂纹生成的难易程度和扩展程度，而材料内部裂纹的萌发、扩展和相互作用集中表现在材料的晶界和相界面上；因此，本研究通过有效的设计和控制界面结构，改变材料内部微裂纹的萌生和扩展条件，为可加工陶瓷的设计和制备提供新的研究途径。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。