Data Base

Review questions

1. Redundancy — is a corresponding part of data or stored same date in different places. It grapes more space and uses more time to update your data.

2. An entity is a person, place, object, event, or idea for which you want to store and process data. An attribute is a characteristic or property of an entity.

3. A database is a structure that can store information about multiple types of entities, the attributes of those entities, and the relationships between entities.

4. A graphic model for database design in which entities are represented as rectangles and relationships are represented as either arrows or diamonds connected to the entities they relate.

5. Database is a detailed data table model of a database.

6. It is possible to get more information from the same amount of date by using a database approach as opposed to a nondatabase approach because all data is stored in a single database, instead of being stored in dozen of separate files, making the process of obtaining information quicker, easier, and even possible in certain situations.

7. The DBA is the central person or group in an organization in charge of the database and the DBMS that runs the database. The DBA attempts to balance the needs of individuals and the overall needs of the organization.

8. An integrity constraint is a rule that the data in a database must follow. A database has integrity when the data in it satisfies all established integrity constraints. A good DBMS should provide an opportunity for users to incorporate these integrity constraints when they design the database. The DBMS then should ensure that these constraints are not violated.

9. Data independence is the property that lets you change the structure of a database without requiring you to change the programs that access the database. With data independence, you easily can change the structure of the database when the need arises.

10. The more complex a product is in...