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Database/DBMS Interview Questions And Answers - Part I.

1) What Is A Database?

Answer: 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.

In Simple words, database can be your contact book in your mobile, your address book in your laptops. Simple example of database can be: Data collected, maintained and used in airline or railway reservation.

2) What Is DBMS & Database?

Answer: DBMS Stands for "Database Management System". DBMS is a collection of programs that enables user to create and maintain a database. In other words, DBMS is a complex software system that is used to manage, store and manipulate data and metadata used to describe the data.

The DBMS manages the interaction between the end user and the database. 

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

3) What Are The Advantages Of DBMS?

Answer: Some of the advantages of DBMS are:

Redundancy is controlled: Duplicating of data is controlled in DBMS by which the data extraction becomes easy.

Consistency: On controlling of data repetition the data reliability increases and time taken for any operation is completed in less time and extracted data is accurate.

Sharing: One more advantage is the data can be shared among the N number of users who are authorized with restrictions as per there requirement. Unauthorized access is restricted.

Integration: data is stored in form of tables and we can have N number of tables all these tables can be linked with other tables by using keys this makes the retrieval of data easy.

Some other advantages are:
  • Provides multiple user interfaces.
  • Enforces integrity constraints.
  • Provides backup and recovery.

4) What Are The Disadvantages In File Processing System?

Answer: Some of the disadvantages in file processing system are:
  • Data redundancy & inconsistency.
  • Difficult in accessing data.
  • Data isolation.
  • Data integrity.
  • Concurrent access is not possible.
  • Limited Data Sharing & Security Problems.
  • Excessive Program Maintanence

5) Discuss How To Know When There Is A Need Of DBMS & When There Is Not?

Answer: Use a DBMS when the following points are important and necessary:
  • Persistent storage of data.
  • Centralized control of data.
  • Control of redundancy, consistency and integrity.
  • Multiple user support.
  • Sharing of data.
  • Data independence and data documentation.
  • Control of access and security.
  • Backup and recovery.

Don’t go for DBMS when the following points becomes important and necessary:
  • Multiple user access is not needed / required.
  • Data and applications are simple and stable.
  • The initial investment in hardware, software and training is too high.


6) What Is Parallel & Distributed Database? Differentiate Them.
7) Differentiate Between File-Oriented System & Database System?
8) What Are The Applications Of Databases?
9) What Is The Importance Of Databases?
10) What Is DBMS & RDBMS?

11) What Are The Three Types Of Users In DBMS?
12) What Are The Disadvantages Of Database System?
13) Describe The Three Levels Of Data Abstraction?
14) Discuss About External/ View/Individual Level Of The Architecture?
15) Discuss About Logical/ Conceptual Level Of The Architecture?

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