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Thursday 12 September 2013

DBMS INTERVIEW QUESTIONS FREE DOWNLOAD

HI FRIENDS,
           HERE YOU CAN GET SOME IMPORTANT QUESTIONS THAT ARE ASK IN ALL INTERVIEW AND VI-VA.

HERE I COVERED MANY TOPIC WITH DIFFERENT QUESTIONS. THESE QUESTIONS ARE FOR BEGINNER  OR PROFESSIONALS.


INTERVIEW QUESTIONS ARE ON TOPIC THAT ARE COVERED IN THIS BLOG AREJAVA, C. C++, SOFTWARE TESTING, SOFTWARE ENGG, NETWORKING ETC.


 What is database?

A database is a logically coherent collection of data with some inherent meaning, representing some aspect of real world and which is designed, built and populated with data for a specific purpose.

 What is DBMS?

It is a collection of programs that enables user to create and maintain a database. In other words it is general-purpose software that provides the users with the processes of defining, constructing and manipulating the database for various applications.

What is a Database system?

The database and DBMS software together is called as Database system.

Describe the three levels of data abstraction?

The are three levels of abstraction:
1. Physical level: The lowest level of abstraction describes how data are stored.

2. Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.

3. View level: The highest level of abstraction describes only part of entire database.

Define the "integrity rules"?

There are two Integrity rules.
1. Entity Integrity: States that "Primary key cannot have NULL value"

2. Referential Integrity: States that "Foreign Key can be either a NULL value or should be Primary Key value of other relation. 

What is extension and intension?

1. Extension: It is the number of tuples present in a table at any instance. This is time dependent.

2. Intension: It is a constant value that gives the name, structure of table and the constraints laid on it.

 What is Data Independence?

Data independence means that "the application is independent of the storage structure and access strategy of data". In other words, The ability to modify the schema definition in one level should not affect the schema definition in the next higher level.

Two types of Data Independence:

1. Physical Data Independence: Modification in physical level should not affect the logical level.

2. Logical Data Independence: Modification in logical level should affect the view level.
NOTE: Logical Data Independence is more difficult to achieve



FOR MORE DOWNLOAD FROM BELOW LINK


SO DOWNLOAD INTERVIEW QUESTION FROM BELOW LINK.


   
BEST OF LUCK IN ADVANCE......GOD IS ALWAYS WITH YOU

IF yOU HAVE ANY STOCK OF QUESTION, THEN PLEASE SEND ME FOR OTHER HELPFUL STUDENTS.

 
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