Deutsche Bank Interview Questions, Process, and Tips

Q1. What is the difference between a HashMap, a ConcurrentHashMap, and a synchronized HashMap?
Ans. 
HashMap is not thread-safe, ConcurrentHashMap allows concurrent access, synchronized HashMap uses explicit synchronization.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if accessed by multiple threads simultaneously.

• ConcurrentHashMap allows concurrent access by multiple threads without the need for external synchronization.

• Synchronized HashMap uses explicit synchronization to make it thread...read more
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Q2. What is a lambda expression, and how does it relate to functional interfaces? Could you provide an example?
Ans. 
A lambda expression is a concise way to represent an anonymous function, often used with functional interfaces in Java.
• Lambda expressions provide a way to pass functionality as an argument to a method.

• Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

• Example: (x, y) -> x + y is a lambda expression that takes two parameters and returns their sum.
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Array questions were asked of medium level

Questions on linkedlist, trees, graphs were asked

Q1. Projects based question
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Q2. Why join us like hr questions
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Q1. Na..... Don't want to share questions
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Q2. Na., Don't want to share questions
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It was data structures and algorithm

Q1. What is friend function
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Q2. Basic definitions of oops
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Q1. Basics about the jobs and JD
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Q1. Interview with Director
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Q1. How will you increase performance of cobol program when its using number of cursors?
Ans. 
To increase performance of a COBOL program using multiple cursors, consider optimizing the SQL queries, reducing the number of cursors, and using efficient data structures.
• Optimize SQL queries to retrieve only necessary data

• Reduce the number of cursors by combining multiple queries into one

• Use efficient data structures like arrays or tables to store and manipulate data

• Avoid unnecessary looping and processing within cur
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Q2. How will you resolve division by zero error Socb
Ans. 
To resolve division by zero error, check for zero before performing division operation.
• Check if the denominator is zero before performing division operation

• Handle the error by displaying a message or returning a default value

• Use conditional statements or try-catch blocks to prevent division by zero
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Q3. How will you abend the program? by moving error code to Return code
Ans. 
Abend the program by moving error code to Return code
• To abend the program, set the return code to a non-zero value indicating an error

• This can be done using a conditional statement to check for errors and then setting the return code accordingly

• For example, in COBOL, you can use the ACCEPT statement to move the error code to the return code
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Q4. Inner Join Outer Join Left Join , String ,Unstring , Inspect all questions
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Q5. How will you check if file is empty ?
Ans. 
To check if a file is empty, you can use file size or read the file and check for any content.
• Check the file size using system functions like stat() or file length property

• Read the file and check if there is any content present

• Use file handling functions to determine if the file is empty
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Q6. How will you read your file in different record structure ?
Ans. 
To read a file with different record structures, use a combination of file parsing techniques and data manipulation.
• Identify the record structure of each section in the file

• Use conditional logic to parse each record based on its structure

• Implement error handling for unexpected record structures

• Utilize tools like regular expressions or custom parsing functions

• Consider using libraries or frameworks that support flexible
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Q7. Is SQLCA EXEC SQL is mandatory ?
Ans. 
No, SQLCA EXEC SQL is not mandatory for Mainframe Developer.
• SQLCA EXEC SQL is not mandatory but can be used for error handling and status checking in COBOL programs.

• It is used to retrieve information about the most recent SQL operation.

• Developers can choose to use SQLCODE and SQLSTATE instead of SQLCA EXEC SQL.
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Q8. How will you give data from Cobol to JCL ?
Ans. 
Data from Cobol can be passed to JCL using file handling techniques like writing data to a dataset or passing parameters through PROCs.
• Use file handling techniques to write data from Cobol program to a dataset that can be accessed by JCL.

• Pass parameters from Cobol program to JCL using PROCs.

• Use symbolic parameters in JCL to reference data from Cobol programs.
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Q9. What syntax you give in Parm parameters to not be abend job when Subscript had ended his limit?
Ans. 
Use the COND parameter in the JCL to prevent job abend when subscript limit is reached.
• Use COND parameter in JCL to check for subscript limit before executing subsequent steps

• Set COND parameter to check for specific return code when subscript limit is reached

• Add a condition to bypass subsequent steps if subscript limit is exceeded
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Q10. How you will add 10 th additional record in file using Cobol program , what is the path.
Ans. 
To add the 10th additional record in a file using a Cobol program, you would need to read the file sequentially and write the new record at the appropriate position.
• Read the file sequentially until you reach the 9th record

• Write the 10th record at the current position in the file

• Update the file with the new record
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Test about 50 questions, 25 technical 25 general logic

Q1. What is semaphores
Ans. 
Semaphores are a synchronization tool used in operating systems to control access to shared resources by multiple processes.
• Semaphores can be used to prevent race conditions in concurrent programming

• They can be either binary (0 or 1) or counting (integer value)

• Operations on semaphores include wait (P) and signal (V)

• Example: Using semaphores to control access to a shared memory buffer
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Q2. Write the code to find prime nos using stream api
Ans. 
Using stream API to find prime numbers in Java
• Use IntStream to generate a stream of numbers

• Filter out non-prime numbers using a custom method

• Check if a number is prime by dividing it by all numbers less than itself
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Q3. Design Patterns in microservices
Ans. 
Design patterns in microservices help in structuring and organizing code for scalability and maintainability.
• Use patterns like Service Registry, Circuit Breaker, and API Gateway for communication between microservices.

• Implement patterns like Saga, CQRS, and Event Sourcing for managing data consistency and scalability.

• Consider patterns like Bulkhead, Retry, and Timeout for fault tolerance and resilience in microservices
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Q4. How to improve performance of website, product
Ans. 
To improve website or product performance, focus on optimizing speed, user experience, and SEO.
• Optimize website loading speed by reducing image sizes and minimizing HTTP requests

• Improve user experience by simplifying navigation and enhancing mobile responsiveness

• Enhance SEO by creating high-quality content, using relevant keywords, and obtaining backlinks
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Q5. Evacuation strategies
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Q6. Advantages of microservices and limitations of rest
Ans. 
Microservices offer scalability and flexibility, while REST has limitations in terms of performance and complexity.
• Microservices allow for independent development and deployment of services, leading to better scalability.

• Microservices promote flexibility and agility in software development by breaking down applications into smaller, manageable components.

• REST APIs can be limited in terms of performance due to multiple ...read more
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