Sima Marine India Interview Questions and Answers

Basic c Programming and Embedded Systems

Q1. C and Do-178b questions
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Q1. C and Embedded system and Project related
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Q1. Manager Round, Mostly technical
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Q1. Package discussion and my previous employer details
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Q1. Experience in domains
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Q2. Previous companies
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Q1. SQL basic questions
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Q2. .net and OOP basics
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Q1. Differnce between truncate and drop.
Ans. 
Truncate removes all records from a table, while drop deletes the table itself.
• Truncate is a DDL command, while drop is a DDL command.

• Truncate is faster than drop as it does not log individual row deletions.

• Truncate can be rolled back, while drop cannot be rolled back.

• Truncate resets the identity seed of the table, while drop does not.

• Example: TRUNCATE TABLE TableName; DROP TABLE TableName;
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Q1. Package discussion
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Q1. Two online questions to know your personality traits.
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Q1. Team handling situation based questions.
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Q2. Certification related questions
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Q3. Past experiences based
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Q1. Lean based questions
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Q2. Team handling situations
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Q3. Past experience based
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Q1. What are the various mechanisms, apart from synchronized locks, to restrict multiple threads from making modifications in Java?
Ans. 
Java provides several mechanisms beyond synchronized locks to manage thread safety and restrict concurrent modifications.
• 1. ReentrantLock: A more flexible locking mechanism that allows for timed and interruptible locks. Example: ReentrantLock lock = new ReentrantLock();

• 2. ReadWriteLock: Allows multiple threads to read but only one to write, improving performance for read-heavy scenarios. Example: ReadWriteLock rwLock =...read more
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Q2. What are the methods for implementing Interprocess Communication in a Microservice Architecture?
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Interprocess Communication in microservices can be achieved through various methods like REST, messaging queues, and gRPC.
• RESTful APIs: Services communicate over HTTP using JSON or XML. Example: A user service fetching data from an order service.

• Message Queues: Asynchronous communication using tools like RabbitMQ or Kafka. Example: Order service sending messages to a payment service.

• gRPC: High-performance RPC framework...read more
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Q3. How can multiple requests to modify specific rows be restricted using the DataJPA interface in Spring Data JPA?
Ans. 
Use optimistic locking and transaction management to restrict concurrent modifications in Spring Data JPA.
• Implement optimistic locking using @Version annotation in your entity class.

• Use @Transactional annotation to manage transactions effectively.

• Handle OptimisticLockingFailureException to manage conflicts gracefully.

• Consider using pessimistic locking with EntityManager for critical sections.
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Q4. What are the different types of JVM memory and their uses?
Ans. 
JVM memory is divided into several areas, each serving specific purposes for efficient memory management in Java applications.
• Heap Memory: Used for dynamic memory allocation for Java objects. Example: Objects created using 'new'.

• Stack Memory: Stores method call frames, local variables, and references. Example: Primitive data types and object references.

• Method Area: Contains class-level data such as class structures, me...read more
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Q5. What is the purpose of the String Constant Pool in Java?
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The String Constant Pool optimizes memory usage by storing unique string literals in Java.
• Strings are immutable in Java, meaning once created, they cannot be changed.

• The String Constant Pool is a special memory area in the Java heap.

• When a string literal is created, Java checks the pool first to see if it already exists.

• If it exists, the reference to the existing string is returned; if not, a new string is created.

• Exam...read more
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Q1. Basics about company.
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Q2. Basics about family.
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Q3. General knowledge questions
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Had the coding round and we have to solve the find nth largest element.

Q1. Java 8 concepts and oops concepts
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