Essay on Database And Dbms And Rdbms

Essay on Database And Dbms And Rdbms

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1. What is database?
A prearranged collection of figures known as data is called database.

2. What is DBMS?
It is a collection of programs that enables user to create and maintain a Database.

3. What is a Database system?
The database and DBMS software together is called as Database system.

4. What is RDBMS ?
RDBMS are database management systems that maintain data records and indices in tables.

5. What are the advantages of DBMS?
Redundancy is controlled.
Unauthorised access is restricted.
Providing multiple user interfaces.
Enforcing integrity constraints.
Providing backup and recovery.

6. What are the disadvantage in File Processing System?
Data redundancy and inconsistency.
Difficult in accessing data.
Data isolation.
Data integrity.
Concurrent access is not possible.
Security Problems.

7. Whats the difference between DBMS and RDBMS?
DBMS provides a systematic and organized way of storing, managing and retreiving from collection of logically related information. RDBMS also provides what DBMS provides but above that it provides relationship integrity.

8. Describe the three levels of data abstraction?
The are three levels of abstraction:
Physical level: The lowest level of abstraction describes how data are stored.
Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.
View level: The highest level of abstraction describes only part of entire database.

9. What is SQL ?
Structured Query Language(SQL) is a language designed specifically for communicating with databases. SQL is an ANSI (American National Standards Institute) standard

10. What are the different type of SQL 's statements ?
SQL statements are broadly classified into three. They...


... middle of paper ...


...rity rules"?
There are two Integrity rules.
Entity Integrity: States that "Primary key cannot have NULL value"
Referential Integrity: States that "Foreign Key can be either a NULL value or should be Primary Key value of other relation.

17. What are super, primary, candidate and foreign keys?
A superkey is a set of attributes of a relation schema upon which all attributes of the schema are functionally dependent. No two rows can have the same value of super key attributes.
A Candidate key is minimal superkey, i.e., no proper subset of Candidate key attributes can be a superkey.
A Primary Key is one of the candidate keys. One of the candidate keys is selected as most important and becomes the primary key. There cannot be more that one primary keys in a table.
Foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table.

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