10. What is the difference between logical data independence and physical data independence?The user interface is where physical data independence occurs whereas the logical interface is where logical data independence occurs. The logical interface is where physical data independence occurs ...
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...
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 logical data structures, using entities to represent real-world objects and relationships to represent their interactions. ...
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...
There are two types of data independence – Physical data independence and Logical data independence. In this part, we will give you separate introductions to them both and a logical vs physical data independence review will be listed. Physical Data Independence ...
Logical and Physical Data Independencedoi:10.1007/978-1-4899-7993-3_80651-1Database schema; DBMS 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...Elmasri, Ramez...
The opposite of logical in its jargon sense. Compare real, virtual, and transparent.It is said that what you can touch and see is real; what you can see but not touch is virtual; what you can touch but not see is transparent; and what you can neither touch nor see is probably imagin...
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: ...
Physical database design is the most detailed and technical level of the database design process. At this stage, designers make decisions about how the logical design will be implemented on a specific DBMS. Considerations include indexing, storage, performance optimization, and security measures....
加整况条万京增极相计交决就指心手低周号加整况条万京增极相计交决就指心手低周号数据库系统中,物理数据独立性〔 physical data independence是指.加整