Download what is the Database abstraction level?

answerExercise 5
1. What is the database?
is a collection of information that is organized so that it can easily be
accessed, managed, and updated. In one view, databases can be
classified according to types of content: full-text, numeric, and
images.
2. what is the Database abstraction level?
Physical level, Logical level, View level
3. Describe the Data base abstraction level?
1) Physical level.
The lowest level of abstraction describes how the data are
actually stored.
2) Logical level.
The next-higher level of abstraction describes what data are
stored in the database, and what relationships exist among
those data.
3) View level:
The variety of information stored in a large database. Many
users of the database system do not need all this information;
instead, they need to access only a part of the database. The
view level of abstraction exists to simplify their interaction with
the system.
4. What is the database management system?
is a collection of programs that enables you to store, modify, and
extract information from a database.
5. What is the database administrator?
is the central authority for managing a database system.
6. Describe the DBA’s responsibilities?
i. granting privileges to users who need to use the
system
ii. classifying users and data in accordance with the
policy of the organization(‫)وفقا لسياسة المنظمه‬
The DBA is responsible for the overall security of the database
system.