Deutsche Bank Interview Questions, Process, and Tips

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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Q1. What are Corporate Actions?
Ans. 
Corporate Actions are events initiated by a publicly traded company that can affect the securities issued by the company.
• Corporate Actions include events such as stock splits, dividends, mergers, acquisitions, spin-offs, and rights issues.

• These events can impact the value of securities held by investors and require adjustments to be made in fund accounting.

• Fund accountants need to accurately record and track Corporate ...read more
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Q2. How is NAV calculated? What is NAV validation?
Ans. 
NAV is calculated by subtracting liabilities from assets and dividing by the number of outstanding shares. NAV validation ensures accuracy of the calculated NAV.
• NAV is calculated by taking the market value of assets, subtracting liabilities, and dividing by the number of outstanding shares.

• For example, if a fund has $1,000,000 in assets, $100,000 in liabilities, and 100,000 outstanding shares, the NAV would be ($1,000,...read more
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Q1. Question about big data and big query
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Q2. Question about pyspark
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Q1. Salary expectation & why you want to join db ?
Ans. 
I am looking for a competitive salary that reflects my experience and skills. I want to join db because of its reputation for innovation and growth opportunities.
• I am seeking a salary that aligns with my level of experience and expertise in the industry.

• I believe db offers a dynamic and innovative work environment that will allow me to grow and develop professionally.

• I am attracted to db's reputation as a leader in the...read more
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Q1. Java 8 Features
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Q2. Default Interface
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Q3. Write code for Builder/Factory Pattern, basically anything other than Singleton
Ans. 
Builder/Factory Pattern is used to create objects with complex initialization logic.
• Builder Pattern separates the construction of a complex object from its representation.

• Factory Pattern creates objects without specifying the exact class of object that will be created.

• Builder Pattern is often used to create immutable objects with many optional parameters.

• Factory Pattern is used when there is a need to create multiple i...read more
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Q4. Why is Redux used in React
Ans. 
Redux is used in React to manage the application state in a predictable way.
• Centralized state management for React applications

• Predictable state changes with actions and reducers

• Easier debugging and testing of state changes

• Facilitates communication between components
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Q5. Second Highest Salary from Employee Table
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Q6. Filter a List using Streams
Ans. 
Filter a List using Streams in Java
• Use the filter() method to apply a predicate to each element in the stream

• Use collect() method to convert the stream back to a List

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); List filteredNames = names.stream().filter(name -> name.startsWith("A")).collect(Collectors.toList());
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Q1. Write snippet for creating an Entity Class.
Ans. 
Creating an Entity Class in Java
• Define class with @Entity annotation

• Add @Id annotation for primary key

• Include fields with appropriate data types
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Q2. Different Types of Autowiring
Ans. 
There are three types of autowiring in Spring: byType, byName, and constructor.
• byType: Spring looks for a bean of the same type and injects it.

• byName: Spring looks for a bean with the same name and injects it.

• constructor: Spring looks for a constructor and injects the arguments.
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Q3. Lazy vs Eager Fetch
Ans. 
Lazy fetch loads data only when needed, while eager fetch loads all related data upfront.
• Lazy fetch is more efficient for performance as it only loads data when required.

• Eager fetch can lead to performance issues by loading unnecessary data upfront.

• Lazy fetch is the default behavior in JPA, while eager fetch needs to be explicitly specified.

• Example: Lazy fetch can be used for loading a list of items in a shopping cart ...read more
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Q4. Transaction Management in Hibernate
Ans. 
Transaction management in Hibernate ensures ACID properties for database operations.
• Hibernate provides built-in transaction management support through Session interface.

• Transactions can be managed programmatically using beginTransaction(), commit(), and rollback() methods.

• Hibernate also supports declarative transaction management using annotations like @Transactional.

• Transactions in Hibernate ensure Atomicity, Consiste...read more
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Q5. Attached Entity vs Detached Entity
Ans. 
Attached entities are actively managed by the persistence context, while detached entities are no longer actively managed.
• Attached entities are being managed by the persistence context and any changes made to them will be automatically synchronized with the database.

• Detached entities are not being managed by the persistence context and changes made to them will not be automatically synchronized with the database.

• Entiti...read more
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Q6. Write Snippet to create two beans
Ans. 
Creating two beans in Java using Spring framework
• Use @Component annotation to define a bean

• Specify the bean name using @Component("beanName")

• Use @Autowired annotation to inject one bean into another
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Q7. Sort an Employee HashMap
Ans. 
Sort an Employee HashMap based on keys or values
• Use TreeMap to automatically sort by keys

• Use Comparator to sort by values

• Convert HashMap to List and then sort
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