3i Infotech Placement: Sample Questions 259 - 260 of 1245

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Question 259


Describe in Detail


What is a Database system?


Figure of the Database System

Popular types of DBMS

  • Rational database management system (RDMS) :

    - Aadaptable to most use cases, but RDBMS Tier-1 products can be quite expensive.

  • In-memory database management system (IMDBMS) :

    - Provides faster response times and better performance.

  • Columnar database management system (CDBMS) :

    -Well-suited for data warehouses that have a large number of similar data items.

  • Cloud-based data management system

    - The cloud service provider is responsible for providing and maintaining the DBMS.

Advantages of DBMS

  • Segregation of applicaion program.
  • Minimal data duplicacy.
  • Easy retrieval of data.
  • Reduced development time and maintainance need.
  • Data security
  • A locking mechanism for concurrent access.
  • Robust data integrity capabilities
  • Logging and auditing of activity
  • Data abstraction and independence

Question 260


Describe in Detail


How VM works?


Virtual Machine in Figure

Virtual Machine

  • A virtual machine provides idea of a distinct or separate computer system while the real hardware might be shared.
  • Based on architecture of computer- provide functionality of a physical computer.
  • Runs on top of current operating system called the host operating system to provide virtual hardware to guest operating systems.
  • For example Linux can run as guest system on windows host operating system in a VM.
  • Guest operating system runs as if it were running on physical computer.
  • Virtual machine appears to be a real, physical computer.
  • Provided by the virtual functions mapped to real hardware on physical machine- for example, a virtual machine՚s virtual hard disk is stored in a file located on our hard drive.

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