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Technical Interview Questions and Answers :: DBMS


    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.

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    It is a collection of programs that enables the 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.

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    What is a Database system?

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

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    1. Reduces Data Redundancy

    2. Maintains Data Consistent

    3.Query to access data

    4. Security

    5. Easier access by tables

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    Disadvantage in File Processing System?

    1. Redundant Data

    2. Inconsistency

    3. Not easy to access data.

    4. No security

    5. Concurrent access is not allowed.

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    Describe the three levels of data abstraction?

    Physical Level - This is the lowest level of data abstraction which describes which describes how the data is to be stored in the database.

    Logical level - The level describes the data in the database as well as relations between these database.

    View Level- This is the highest level of data abstraction , only some part of actual database is viewed to the user.

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    Define the "integrity 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.

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    What is extension and intension?

    The description of data base is called in tension or database schema,which is specified during database design and is not expected to change frequently.

    The actual data in a database may change quite frequently.The data in a database at a particular moment in time is called a extension or database state or snapshot.

    Source:- Extension and intension

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    What is System R? What are its two major subsystems?

    System R was designed and developed over a period of 1974-79 at IBM San Jose Research Center. It is a prototype and its purpose was to demonstrate that it is possible to build a Relational System that can be used in a real life environment to solve real life problems, with the performance at least comparable to that of the existing system.
    Its two subsystems are
    > Research Storage
    > System Relational Data System.

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    How is the data structure of System R different from the relational structure?

    Unlike Relational systems in System R
    > Domains are not supported
    > Enforcement of candidate key uniqueness is optional
    > Enforcement of entity integrity is optional
    > Referential integrity is not enforced

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Database Management System(DBMS) is an important subject for Freshers and Experienced candidates, Who are looking to grab a job as a Database Developer or Administrator. Practice the frequently Asked DBMS Technical Interview Questions and Answers - Q4Interveiw.com asked at Freshers and Experienced level. Most of the listed questions here have been previously asked during the technical rounds in IT companies. You can test your SQL database knowledge by solving these questions and compare your chances of getting the job with a top IT company.

Go through the basics of Database Management System before the interview process. Here, listed DBMS interview questions are Frequently asked during an Interview with different companies like Wipro, Accenture, TCS, Oracle, CTS, Adobe, TechM.

You can Filter the question set by the company name easily. If you are not sure about a specific answer, you can easily click and read the answer along with the explanation. So, check these SQL Technical Interview Questions and Answers to prepare for your dream job.