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MBit Computraining Interview Questions and Answers

Updated 13 Jun 2024

Q1. What is difference between abstract class and interface?

Ans.

Abstract class can have implementation while interface cannot. A class can implement multiple interfaces but only extend one abstract class.

  • Abstract class can have constructors while interface cannot

  • Abstract class can have non-abstract methods while interface cannot

  • Interfaces are used for multiple inheritance while abstract classes are used for single inheritance

  • Abstract classes can have instance variables while interfaces cannot

  • Example: Abstract class - Animal, Interface - F...read more

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Q2. What is difference between dataset and datareader

Ans.

Dataset is an in-memory representation of a database while DataReader is a forward-only, read-only stream of data.

  • Dataset is disconnected and can be modified while DataReader is connected and read-only

  • Dataset can hold multiple tables while DataReader can only hold one table at a time

  • Dataset is slower than DataReader for large amounts of data

  • Dataset can be used for data manipulation while DataReader is used for read-only access

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Q3. Introduced yourself, what is Selenium, what is webdriver, what Agile methodology, Difference between find element and find elements.

Ans.

Selenium is a tool for automating web browsers. WebDriver is a component of Selenium. Agile is a software development methodology.

  • Selenium is used for automating web browsers to test web applications.

  • WebDriver is a component of Selenium that provides a programming interface to control the browser.

  • Agile is a software development methodology that emphasizes iterative development and collaboration between cross-functional teams.

  • findElement() is used to locate a single web elemen...read more

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Q4. What is Index? Type of index?

Ans.

An index is a data structure that improves the speed of data retrieval operations on a database table.

  • Indexes are used to quickly locate data without having to search every row in a database table.

  • Types of indexes include clustered, non-clustered, unique, and full-text indexes.

  • Clustered indexes determine the physical order of data in a table, while non-clustered indexes create a separate structure to store the index data.

  • Unique indexes ensure that each value in the index colu...read more

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Q5. What is appache server configuration file

Ans.

The Apache server configuration file is a text file that contains directives for configuring the Apache web server.

  • The default location of the configuration file is /etc/httpd/conf/httpd.conf on Red Hat-based systems and /etc/apache2/apache2.conf on Debian-based systems.

  • The configuration file is used to set options such as the server's port number, document root directory, and virtual hosts.

  • The file can be edited manually or through a graphical interface such as Webmin or cPa...read more

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Q6. Difference between PLSQL And SQL ?

Ans.

PL/SQL is a procedural extension of SQL used for writing stored procedures, functions, and triggers.

  • PL/SQL stands for Procedural Language/SQL, while SQL stands for Structured Query Language.

  • SQL is used for querying and manipulating data in a database, while PL/SQL is used for writing procedural code like stored procedures and functions.

  • PL/SQL allows for more complex logic and control flow compared to SQL.

  • PL/SQL can include variables, loops, conditional statements, and excepti...read more

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Q7. How to extent lvm size

Ans.

To extend LVM size, we need to add physical volumes and then extend the logical volume.

  • Add a new physical volume using the 'pvcreate' command

  • Extend the volume group using the 'vgextend' command

  • Extend the logical volume using the 'lvextend' command

  • Resize the file system using the appropriate command for the file system type

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Ans.

SQL is a programming language used for managing and manipulating databases.

  • SQL stands for Structured Query Language.

  • It is used to communicate with and manipulate databases.

  • SQL can be used to retrieve data, update data, insert data, and delete data from databases.

  • Common SQL commands include SELECT, INSERT, UPDATE, DELETE, CREATE, and DROP.

  • Example: SELECT * FROM customers WHERE country = 'USA';

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