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Characteristics of DBMS ?

    • A) non-redundant
    • B) data independence
    • C) increased security
    D) all the above

Answer : D) all the above

What is DBMS ?

  • A database management system (DBMS) is a software package designed to define manipulate, retrieve and manage data in a database.
  • A DBMS mostly manipulates the data itself, the data format, field names, record structure and file structure. It also defines rules to validate and manipulate this data.
  • A DBMS relieves users of framing programs for data maintenance. Fourth-generation query languages, such as SQL, are used along with the DBMS package to interact with a database.
  • Some other DBMS examples include:
    • MySQL
    • SQL Server
    • Oracle
    • dBASE
    • FoxPro
Characterstics of DBMS
  • Data abstraction and independence.
  • Data security.
  • A locking mechanism for concurrent access.
  • An efficient handler to balance the needs of multiple applications using the same data.
  • The ability to swiftly recover from crashes and errors, including restartability and recoverability.
  • Robust data integrity capabilities.
  • Logging and auditing of activity.
  • Simple access using a standard application programming interface (API).
  • Uniform administration procedures for data.
Characteristics of DBMS

Characteristics of DBMS

Advandages of DBMS

  • One of the most advantages of using a DBMS is that it lets end users and application programmers access and use the same data while managing data integrity.
  • Data is better protected and maintained when it can be shared using a DBMS instead of creating new iterations of the same data stored in new files for every new application.
]]> https://www.wikitechy.com/interview-questions/dbms/characteristics-of-dbms/feed/ 0 What is DBMS ? https://www.wikitechy.com/interview-questions/dbms/what-is-dbms/ https://www.wikitechy.com/interview-questions/dbms/what-is-dbms/#respond Mon, 19 Jul 2021 10:26:42 +0000 https://www.wikitechy.com/interview-questions/?p=1035

What is DBMS ?

  • DBMS is represented by the DataBase Management System. A database management system (DBMS) is a software that allows creation, definition and manipulation of database, allowing users to store, process and analyze data easily.
  • DBMS provide us with an interface or a tool, to perform various operations like creating database, storing data in it, updating data, creating tables in the database and a lot more.
  • DBMS also provides protection and security to the databases.
  • It also maintains data consistency in case of multiple users.
  • Here are some examples of popular DBMS used these days:
    • MySQL
    • Oracle
    • SQL Server
    • IBM DB2
    • PostgreSQL
    • Amazon Simple DB (cloud based) etc.
What is DBMS

What is DBMS

Types of DBMS

  • Hierarchical Databse Model.
  • Network Databse Model.
  • Relational Databse Model.
  • Object-Oriented Databse Model.

Hierarchical Databse Model

  • In a Hierarchical database model, the data is organized in a tree-like structure.
  • Data is Stored Hierarchically (top down or bottom up) format.
  • Data is represented using a parent-child relationship that are one to one or one to many.
  • In Hierarchical DBMS parent may have many children, but children have only one parent.
Hierarchical database Model

Hierarchical database Model

Network Database Model

  • The network database model allows each child to have multiple parents.
  • If you need to address the model help us to more complex relationships like as the orders/parts many-to-many relationship.
  • In this model, the entities are organized in a graph which can be accessed through several paths.
Network Database Model

Network Database Model

Relational Databse Model

  • Relational DBMS is the most widely used DBMS model because it is one of the easiest.
  • This model is based on normalizing data in the rows and columns of the tables.
  • Relational model stored in fixed structures and manipulated using SQL.
Relational Databse Model

Relational Databse Model

Object-Oriented Databse Model

  • In Object-oriented Model data stored in the form of objects.
  • The structure which is called classes which display data within it. It defines a database as a collection of objects which stores both data members values and operations.
Object-Oriented Databse Model

Object-Oriented Databse Model

Advantages

  • Improved data sharing.
  • Improved data security.
  • Better data integration.
  • Minimized data inconsistency.
  • Improved data access.
  • Improved decision making.
  • Increased end-user productivity.

Disadvantages

  • Increased costs.
  • Management complexity.
  • Maintaining currency.
  • Frequent upgrade/replacement cycles.
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