Digilytics AI Interview Questions and Answers

Q1. What is the architecture of the Java Virtual Machine (JVM)?
Ans. 
The Java Virtual Machine (JVM) is an abstract computing machine that enables a computer to run Java programs.
• JVM is platform-independent and converts Java bytecode into machine code.

• It consists of class loader, runtime data areas, execution engine, and native method interface.

• JVM memory is divided into method area, heap, stack, and PC register.

• Examples of JVM implementations include Oracle HotSpot, OpenJ9, and GraalVM.
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Q2. What is the default connection pooling in Spring Boot, and how can it be customized?
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The default connection pooling in Spring Boot is HikariCP, which can be customized through properties in the application.properties file.
• HikariCP is the default connection pooling library in Spring Boot, known for its high performance and low overhead.

• To customize the connection pooling, you can modify properties like 'spring.datasource.hikari.*' in the application.properties file.

• For example, you can set maximum pool ...read more
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Q3. What are the best practices for optimizing a Spring Boot application?
Ans. 
Best practices for optimizing a Spring Boot application
• Use Spring Boot Actuator to monitor and manage application performance

• Implement caching mechanisms like Spring Cache to reduce database calls

• Optimize database queries and indexes for better performance

• Use asynchronous processing with Spring's @Async annotation for non-blocking operations

• Profile and analyze application performance using tools like VisualVM or JProfi
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Q4. What is a heap dump, and how can it be used to identify memory leaks?
Ans. 
A heap dump is a snapshot of the memory usage of a Java application at a specific point in time.
• Heap dumps can be generated using tools like jmap or VisualVM.

• They provide detailed information about objects in memory, their sizes, and references.

• Analyzing a heap dump can help identify memory leaks by pinpointing objects that are consuming excessive memory.

• Common signs of memory leaks in a heap dump include a large numbe...read more
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Q5. How can you diagonally iterate through and print the elements of a 2D array?program
Ans. 
Diagonally iterate through and print elements of a 2D array of strings.
• Use nested loops to iterate through rows and columns of the 2D array.

• Calculate the diagonal elements by incrementing row and column indices together.

• Print the elements as you iterate through the diagonal of the array.
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Here’s a simple framework to approach a case study effectively:


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Case Study Framework

1. Understand the Problem

Read the case thoroughly and identify the key issue.

Ask clarifying questions if needed (if in a live setting).

Summarize the problem in your own words.



2. Analyze the Situation

SWOT Analysis (Strengths, Weaknesses, Opportunities, Threats)

Identify relevant stakeholders.

Gather data or key insights from the case text.



3. Identify Alternatives

Brainstorm possible solutions to the problem.

Consider multiple approaches (e.g., short-term vs. long-term solutions).



4. Evaluate the Alternatives

Weigh the pros and cons of each solution.

Assess feasibility, costs,

Q1. What are the common performance issues that can occur in a system?
Ans. 
Common performance issues in a system include slow response times, high resource usage, bottlenecks, and crashes.
• Slow response times can be caused by inefficient code, network latency, or overloaded servers.

• High resource usage can lead to system slowdowns and crashes, often caused by memory leaks or inefficient algorithms.

• Bottlenecks occur when a component of the system becomes a limiting factor, such as a database ser...read more
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Q2. What is your experience with software bug fixing?
Ans. 
I have experience in identifying and resolving software bugs through thorough testing and collaboration with developers.
• Identifying bugs by reproducing issues reported by users

• Collaborating with developers to understand root cause of bugs

• Testing bug fixes to ensure they are effective

• Utilizing bug tracking tools like Jira or Bugzilla

• Experience with regression testing to prevent reoccurrence of bugs
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Shortcut Tips for Coding Tests: 1. Master the Basics: Familiarize yourself with arrays, strings, loops, and conditional statements. 2. Learn Patterns: Concentrate on sliding window, two-pointer techniques, recursion, and divide-and-conquer methods. 3. Use Standard Algorithms: Study breadth-first search (BFS), depth-first search (DFS), sorting algorithms, and dynamic programming principles. 4. Understand Data Structures: Practice with stacks, queues, linked lists, and trees. 5. Practice Edge Cases: Consider scenarios involving empty inputs, duplicates, and large datasets. 6. Write Pseudocode: Outline your plan before starting to code. 7. Optimize Early: Always strive for efficiency in your solutions.

They gave 100 aptitude questions like distance,time,logical reasoning , puzzle, etc.. to solve within 1 hour but 40 marks is pass mark.

Q1. I said that I know html, css and basics of C#. So, they gave first question as do the web page designing using html and css. In page, it contains header and footer. In between header and footer the body t...read more
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Q2. Sum of digits inc#
Ans. 
The question is asking for a program to calculate the sum of digits in a given number.
• Create a function that takes in a number as input

• Convert the number to a string to iterate through each digit

• Sum up all the digits and return the total
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Q3. Scenario based basic program question. 15 team players in the cricket team . But you have to choose only 11 members to play. He told that 11 members have binary value 1 and another 4 members have binay va...read more
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Q4. In sql server, join two tables it contains same columns but don't use joins.
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Basic Hacker Rank SQL Questions 2 . and 10 MCQ based

Q1. Select customer, sum(amt ) as total_amt from t1 group by customer how many no. of rows it will return and explain this table t1 column name-> dept customer item amt
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Q2. Select * , sum(amt) over (partition by customer) as total_amt from t2
Ans. 
The query selects all columns and calculates the total amount for each customer in table t2.
• The query uses a window function to calculate the sum of 'amt' for each customer in the 't2' table.

• The 'partition by customer' clause divides the result set into partitions based on the 'customer' column.

• The 'select *' statement selects all columns from the table along with the calculated total amount.

• The 'sum(amt) over (partiti...read more
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Q3. How many Customers has purchased same item on the Same day more than onnce
Ans. 
To find customers who purchased the same item multiple times on the same day.
• Identify unique customers who purchased the same item multiple times on the same day

• Check for duplicate transactions by customer and item on the same day

• Aggregate the data to count the number of customers who made multiple purchases of the same item on the same day
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Q1. What you know about It hardware?
Ans. 
IT hardware refers to physical components of a computer system, such as the motherboard, CPU, RAM, and hard drive.
• IT hardware includes components like motherboards, CPUs, RAM, and hard drives.

• It also encompasses peripherals like monitors, keyboards, and printers.

• Understanding IT hardware is essential for troubleshooting and maintaining computer systems.

• Examples of IT hardware brands include Intel, AMD, Samsung, and Wes
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Q2. What you know about material management?
Ans. 
Material management involves planning, organizing, and controlling the flow of materials from acquisition to consumption.
• Involves procurement, storage, and distribution of materials

• Focuses on optimizing inventory levels to meet demand

• Includes forecasting, inventory control, and supplier management

• Ensures efficient use of resources and cost-effective operations
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Q1. What you know about IT hardware?
Ans. 
IT hardware refers to physical components of a computer system, such as the motherboard, CPU, RAM, and hard drive.
• IT hardware includes components like motherboards, CPUs, RAM, hard drives, and graphics cards.

• Understanding IT hardware is essential for troubleshooting computer issues and upgrading systems.

• Examples of IT hardware brands include Intel, AMD, NVIDIA, and Western Digital.
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Q2. What you know about material management ?
Ans. 
Material management involves planning, organizing, and controlling the flow of materials from acquisition to use or disposal.
• Involves procurement, storage, and distribution of materials

• Ensures efficient use of resources and cost-effective operations

• Includes inventory management and supply chain optimization

• Focuses on reducing waste and improving productivity

• Examples: Just-in-time inventory system, ABC analysis for inve
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Aptitude and Logical Reasoning

Q1. Understanding of current roles and responsibilities
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Q2. Behavioural questions
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Q1. Discussion of current roles and responsibilities
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Q2. Behavioural questions to check the role fit
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Q1. Discussion on current roles and responsibilities
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Q2. How do you convince a Upset customer
Ans. 
Listen to their concerns, empathize with them, offer solutions, and follow up to ensure satisfaction.
• Listen actively to their concerns without interrupting.

• Empathize with their situation and show understanding.

• Offer solutions or alternatives to address their issues.

• Follow up with the customer to ensure their satisfaction and resolve any remaining concerns.

• Apologize for any inconvenience caused and take responsibility f...read more
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Q3. Culture fit check
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Q1. Questions on API's, Technical Architecture
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Q2. Culture fit check
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Q3. Scenario based questions with respect to Development and coding and API's
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Q1. Project based questions
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Q2. Metrics based questions
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Q3. Client handling based questions
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Q4. Changing Team members based scenarios questions
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Q1. Questions on fundamental concepts of cybersecurity.
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Q2. What are the Business As Usual (BAU) activities in your current company, and what is the rationale behind them?
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Q3. Will give a scenario and questions based on that.
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Q4. Can you describe a challenging situation you faced and how you overcame it?
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Q5. What types of high and critical alerts have you handled, and what steps did you take to resolve them?
Ans. 
I have handled high and critical alerts related to malware infections, data breaches, and phishing attacks.
• Identifying the source and scope of the alert

• Isolating affected systems to prevent further damage

• Implementing security patches and updates

• Conducting forensic analysis to determine the extent of the breach

• Collaborating with IT teams to strengthen security measures
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Q1. Few similar questions asked in 1st round.
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Q2. Will expect an understanding of security concepts in a bit more detailed manner.
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Q3. What is the architecture of a Security Information and Event Management (SIEM) tool?
Ans. 
SIEM tool architecture includes data collection, normalization, correlation, and reporting components.
• Data collection: Gathers security data from various sources like logs, network traffic, and endpoints.

• Normalization: Standardizes the collected data into a common format for analysis.

• Correlation: Identifies patterns and relationships in the data to detect security incidents.

• Reporting: Generates reports and alerts based...read more
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Q4. Scenario based questions.
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Q1. Tell me about yourself.
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Q2. What information do you have about the company?
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Q3. What are the reasons for choosing this company?
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Q4. Will discuss on general things about you and your previous employers.
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Q5. What is your reason for leaving your current company?
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Q6. What is your current salary, and what are your salary expectations?
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