Tata Communications Senior Developer Lead Interview Questions and Answers

Q1. Sql related ques mege into, rank,dense rank,queries of joins etc.
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Q2. Java 8 related ques optional and stream
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1st round some apt qns,some prgramming qns are they asked

Q1. C depth concepts and some prgram
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Q1. Some DSA questions they asked
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Q1. How to optimise fetching 1 lakh entries from db
Ans. 
Use pagination, indexing, caching, and query optimization to fetch 1 lakh entries efficiently from the database.
• Implement pagination to fetch data in smaller chunks

• Create indexes on columns frequently used in queries

• Use caching to store frequently accessed data

• Optimize queries by avoiding unnecessary joins and using appropriate indexes

• Consider using database-specific optimizations like query hints or stored procedures
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Q1. Reverse a linked list.
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Q2. Merge sort on a array/
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Q1. What is lean back launcher in tv
Ans. 
A lean back launcher in TV is a user interface designed for TVs that allows users to easily navigate and interact with content using a remote control.
• Designed for TVs to provide a user-friendly interface for navigating content

• Optimized for remote control input

• Focuses on simplicity and ease of use for a lean-back experience
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Q2. How Dpad click events works
Ans. 
Dpad click events are used to handle directional pad button clicks on Android devices.
• Dpad click events are typically handled by implementing the onKey() method in a View or Activity.

• Each directional pad button press triggers a specific key event, such as KeyEvent.KEYCODE_DPAD_UP.

• Developers can listen for Dpad click events using setOnKeyListener() method or by overriding dispatchKeyEvent() method.
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Q2. Fweeqw fweewqfqwf wfqwqe weqfwqfwqe
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Q1. What are the things that u do when your what app screen is blank
Ans. 
I would check for internet connection, restart the app, clear cache, and update the app.
• Check internet connection

• Restart the app

• Clear cache

• Update the app
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Q2. Simple python code
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Q1. Memory management in java 8
Ans. 
Java 8 introduced improvements in memory management with features like Metaspace and G1 garbage collector.
• Java 8 introduced Metaspace to replace the PermGen space for class metadata storage.

• G1 garbage collector in Java 8 improves garbage collection performance by dividing the heap into regions.

• Java 8 also introduced the concept of String deduplication to reduce memory usage for String objects.
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Q2. CQRS pattern in microservices
Ans. 
CQRS pattern separates read and write operations in microservices for better scalability and performance.
• CQRS stands for Command Query Responsibility Segregation

• It separates the read and write operations in microservices

• Write operations update the data, while read operations retrieve the data

• Helps in improving scalability and performance by optimizing for each operation type
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