Xyz Company Manager Interview Questions and Answers

Q1. Internal working of HashMap and Concurrency Map
Ans. 
HashMap is a data structure that stores key-value pairs, while Concurrency Map allows for safe concurrent access.
• HashMap internally uses an array of linked lists to store key-value pairs.

• Concurrency Map implementations like ConcurrentHashMap use locks or other mechanisms to allow safe concurrent access.

• HashMap allows for null keys and values, while ConcurrentHashMap does not allow null keys or values.

• Concurrency Map im...read more
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Q2. Multithreading questions
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Q3. Questions on PCF, how the deployment works
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Q4. One Sorting question to list the count of employees by age
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Q1. How to optimize SQL Joins
Ans. 
Optimizing SQL Joins involves using proper indexing, limiting the result set, and avoiding unnecessary joins.
• Use indexes on columns involved in join conditions to improve performance

• Limit the result set by using WHERE clause to filter out unnecessary rows before joining

• Avoid unnecessary joins by only joining the tables that are needed for the query
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Q2. How to optimize performance
Ans. 
Optimizing performance involves setting clear goals, providing feedback, offering training and development opportunities, and fostering a positive work environment.
• Set clear goals and expectations for employees

• Provide regular feedback and recognition for good performance

• Offer training and development opportunities to help employees improve their skills

• Create a positive work environment that promotes collaboration and c...read more
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Medium algo and multi threading questions

Algo and multi threading question

Q1. Implement thread safe singleton
Ans. 
Thread safe singleton can be implemented using double-checked locking or synchronized block.
• Use double-checked locking to ensure only one instance is created.

• Use synchronized block to make sure only one thread can access the creation of instance at a time.

• Example: public class ThreadSafeSingleton { private static volatile ThreadSafeSingleton instance; private ThreadSafeSingleton(){} public static ThreadSafeSingleton ge...read more
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Q2. Other lld questions
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Q1. Roles and responsibilities in the current role
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Q2. Situational questions to check different approaches to solve a problem
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Q1. Product manager giving you case to solve this
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Q1. Market oulook ????
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Q2. Market View ???????
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