4402 hk01 - Copy

4402 hk01 - Copy - Conceptual Internal Internaldata...

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Users External level View 2 View 3 View 1 Conceptual level internal level Physical data organization Database Internal schema Conceptual schema Conceptual Schema External Schema External Schema External Schema Internal Schema Course : CSC 4402 Homwork :1 Student: Shiyin He 1. a.reduced data redundancy when the data in the database is created, the database management software requires a series of rules concerning the data, called constraints, to be defined by the person adding tables to the database. These rules help to ensure that redundancy is minimized and critical unique data is not duplicated. b. improved data security a database contains many application programs which sit between the user and the data to ensure that security in accuracy are not compromised while in traditional ways, it is harder to keep files security. 2. The three-level architecture recognized the need for a three-level approach with a system catalog provides a basis for understanding some of the functionality of a DBMS.
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4402 hk01 - Copy - Conceptual Internal Internaldata...

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