JK Tech Application Support Engineer Interview Questions and Answers

Union combines and removes duplicates, Union All combines without removing duplicates.

• Union is used to combine the result sets of two or more SELECT statements and remove duplicates.

• Union All is used to combine the result sets of two or more SELECT statements without removing duplicates.

• Union is slower than Union All because it has to remove duplicates.

• Use Union when you want to combine and remove duplicates, use Union...read more

Answers to Linux-related questions for Application Support Engineer role

• Heap dump files can be found using the jmap command

• The superuser has complete control over the system and can perform any action

• chmod command can be used to modify file permissions

• Commands like df, du, and ls can be used to check disk usage

• GREP command is used to search for a specific pattern in a file or output

Ten essential commands in Linux for Application Support Engineers

• ls - list directory contents

• cd - change directory

• pwd - print working directory

• cp - copy files and directories

• mv - move/rename files and directories

• rm - remove files and directories

• grep - search text patterns

• chmod - change file permissions

• ps - display information about running processes

• top - display and update sorted information about processes

Yes, I am willing to relocate to the office location.

• I am open to relocating for the right opportunity.

• I understand the importance of being present in the office for effective communication and collaboration.

• I have relocated for previous job opportunities and have had positive experiences.

• I am excited about the prospect of working in a new location and embracing new challenges.

MVC lifecycle involves Model, View, and Controller interactions, while deployment ensures the application is live and accessible.

• 1. Model: Represents data and business logic. Example: A User model that interacts with a database.

• 2. View: Displays data to the user. Example: HTML templates rendering user information.

• 3. Controller: Handles user input and updates the model. Example: A login controller processing user creden...read more

CTE stands for Common Table Expression, a temporary result set in SQL used for complex queries.

• CTE is defined using the WITH clause.

• It can be recursive or non-recursive.

• Example syntax: WITH CTE_Name AS (SELECT column1 FROM table) SELECT * FROM CTE_Name;

• CTEs improve readability and organization of SQL queries.

• They can be referenced multiple times within a query.

CORS is a security feature that allows restricted resources on a web page to be requested from another domain outside the domain from which the resource originated.

• CORS is implemented via HTTP headers that allow servers to specify who can access their resources.

• For example, a web application on 'example.com' can request resources from 'api.example.com' if CORS is enabled.

• The 'Access-Control-Allow-Origin' header is cruc...read more

Bundling and minification optimize web assets by reducing file size and number of requests, improving load times and performance.

• Bundling combines multiple files (e.g., JavaScript, CSS) into a single file to reduce HTTP requests.

• Minification removes unnecessary characters (like whitespace and comments) from code to decrease file size.

• Example of bundling: Combining 'script1.js', 'script2.js', and 'script3.js' into 'bund...read more

HTML helpers are functions that simplify the generation of HTML markup in web applications, enhancing code readability and maintainability.

• HTML helpers are often used in MVC frameworks to generate HTML elements easily.

• Common HTML helpers include methods for creating forms, links, and other UI components.

• Example: In ASP.NET MVC, Html.TextBoxFor() generates an input element for a model property.

• HTML helpers promote DRY (...read more

OOPS features include encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability to create new classes based on existing classes, inheriting their attributes and methods.

• Polymorphism: Ability to use a single interface for different data types or classes.

• Abstraction: Hiding the implementation details and show

Interface is a contract that defines the methods a class must implement, while abstract class can have both implemented and abstract methods.

• Interface methods are public and abstract by default, while abstract class can have abstract and non-abstract methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used for full abstraction, while abstract classes are used fo...read more