This means that the programmers are determining the data access path. Instantly, you have a problem: how do you know that they've made the right decision? 这意味着程序员要确定数据访问路径。问题马上就来了:如何知道程序员是否作出了正确的决定?
However, when new statistics are applied, DB2 will now realize data may not be clustered as previously thought, therefore causing a change to an access path that is less desirable. 但是,当应用新统计数据时,DB2现在将认识到数据可能没有像以前所想的那样收集,因此会导致更改不太理想的访问路径。
Static SQL in DB2 is a powerful capability that can streamline data access at run time by doing some of the work ahead of time, such as determining the database access path. DB2中的静态SQL是一个强大的功能,可以通过预先执行某些工作来简化运行时的数据访问,例如确定数据库访问路径。
In addition, the database can have a better understanding of the state of the data it stores, and thereby can produce a more efficient and dynamic access path to the data. 此外,数据库可以更好地理解它存储的数据的状态,从而可以生成到数据的更有效和动态的存取路径。
Keep in mind that this catalog data is what the optimizer uses to make access path decisions. 请记住,优化器使用编目数据决定访问路径。
Data flows from the bottom up ( as displayed in the graph) and is processed by operation nodes in the access path graph. 数据从下往上流动(如访问路径图所示)并通过访问路径图上的操作节点处理。
This paper illustrates this point by a study on the data placement and access path selection issues in a network storage environment. 就FC-SAN虚拟存储方式中的数据放置和访问路径选择对这一问题进行了研究。
DAFS can make it possible to shorten data access path effectively through RDMA technology, make data access faster and improve the access speed performance in NAS appliance. DAFS通过远程直接内存内存传送技术,能有效地缩短数据存取路径,实现更快速的数据存取,从而有效地改善数据存取速度性能。
The algorithm can extract the information of the user and data from Web sever log, and can identify the user's access path efficiently. 算法可以从Web服务器日志中挖掘出用户信息和数据信息,有效地识别用户访问模式。
General Purpose Data-File Management System DFMS with Fast Access Path 快速存取的通用数据文件管理系统DFMS
The paper first presents a linear time-consuming model of data access through the analysis of the virtual storage principle and then gives a decision-making method for data placement and access path selection problem. 首先通过分析虚拟存储原理提出了一个数据访问耗时的线性模型;然后,就数据放置和访问路径选择提出了一个决策方法;