data independence 数据独立性 logical data independence 逻辑数据独立性 semantic data independence 【计】 语义数据独立性 physical data 物理数据 physical data structure 实体数据结构在数据库中,资料存放在内存媒体上的形式。在某些信息管理系统中,表示段类型和这些段类型在实体数据库中的层次排列的一种层次结...
The logical interface is where physical and logical data independence occurs. Answer:B) The logical interface is where physical data independence occurs whereas the user interface is where logical data independence occurs Explanation: The logical interface is where physical data independence...
Data independence is a professional word used in the database management system where users can create, read, update, and delete data in a database. You may think this concept will be hard to understand but this post onMiniTool Websitewill try its best to make it easy. Let’s start it!
Database schema;DBMS Definition These concepts were developed to separate the database schema that the users and programmers see from the storage details and indexing methods of the database and are best explained using the database architecture known as the three-schema architecture. This architectur...
This separation of access criteria from physical storage characteristics is called physical data independence. 从物理存储特征中分离出访问标准叫作物理数据独立性。 www-128.ibm.com 2. DB2's optimizer is the component that accomplishes this physical data independence. DB2的优化器是完成该物理数据独立性的...
3) off-line data reduction 独立数据处理4) logical data independence 逻辑数据独立性5) dynamic data independence 动态数据独立性6) semantic data independence 语义数据独立性补充资料:地球物理勘探数据处理 将各种地球物理勘探所取得的原始数据,经过电子计算机的加工运算,输出各种数据列表、曲线和图件,以供...
数据库系统中,物理数据独立性( physical data independence )是指 。 A. 数据库与数据库管理系统的相互独立 B. 应用程序与 DBMS 的相互独立 C. 应用程序与存储在磁盘上数据库的物理模式是相互独立的 D. 应用程序与数据库中数据的逻辑结构相互独立 相关知识点: ...
Abstraction.Logical data models abstract away physical details, emphasizing data entities, attributes, and their relationships. Platform independence.Logical data models are independent of the specific DBMS or storage technology. Entity-relationship diagrams (ERDs).ERDs are a common tool for representing l...
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Physical Data Independence, Constraints, and Optimization With Universal PlansAlin DeutschLucian PopaVal TannenPhysical Data Independence, Constraints and Optimization with Universal Plans - Deutsch, Popa, et al. - 2002