数据库系统原理填空题(推荐下载)（Database system principle fill-in-the-blank (recommended download)）.docVIP

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数据库系统原理填空题(推荐下载)（Database system principle fill-in-the-blank (recommended download)）.doc

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数据库系统原理填空题(推荐下载)（Database system principle fill-in-the-blank (recommended download)）

数据库系统原理填空题(推荐下载)（Database system principle fill-in-the-blank (recommended download)） Database system principle short answer 2009/09/19 The first chapter database system basic concepts Data independence in the file system refers to independence. (equipment) 2. The information processing in the database mode occupies the center position. (data) A DBMS is a layer of data management software located in and between. (user OS) 4. The data model not only describes the characteristics of the data itself, but also describes it. (link between data ) In DBS, the conversion between the users data and the data in the disk is implemented. ( The DBMS) 6. In the hierarchy and network model, navigation data is used; In the relational model, navigation data is used. (pointer key) ) 7. The three-level schema structure of the database is the three levels of abstraction. (data) 8. The three-level structure is defined in DBS The DB is called. (data dictionary) 9. The global structure of DBS reflects its structure. (module function ) 10. DBMS opens for application runtime DB system buffer, mainly used for and. (data transmission mode conversion) 11. Hierarchical model use structure to represent the relationship between entities. (tree) 12. The relationship between program and data in the manual management stage of data. (one-to-one correspondence ) 13. The work of defining the security and integrity of the database is completed. (DBA) 14. The benefits of data independence are. (changes in the way data is stored do not affect the use of the application) 15. The three-level architecture of the database allows users to use data abstractly without concern. (data representation and storage in a computer) Chapter ii database design and ER model 1. ER data model is generally used at the stage of data design. Conceptual design ) What are the tables, which fields, and what indexes are created should be in the database design Phase. Physical design ) 3. Data model is used to describe the structure