TCS Production Support Engineer Interview Questions and Answers for Experienced

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Q1. Please ask technical level question?
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Q2. Application support engineer question?
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Q1. What is internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple key-value pairs hash to the same index, they are stored in a linked list at that index.

• To retrieve a value...read more
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Q2. What is difference between hashmap and concurrent hashmap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified while iterating.

• ConcurrentHashMap allows concurrent modifications without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurrently.

• Concurren...read more
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Q3. Can we override main method in java
Ans. 
No, main method in Java cannot be overridden.
• Main method is a static method of a class and cannot be overridden.

• Subclasses can have their own main method, but it will not be considered as the entry point of the program.

• Example: public class SubClass extends MainClass { public static void main(String[] args) { // This is not the entry point of the program }}
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Q4. Write the command to find the hidden files in unix
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Use the 'ls' command with the '-a' flag to find hidden files in Unix.
• Use the command 'ls -a' to list all files, including hidden files.

• Hidden files in Unix start with a dot (.) before the file name.

• Example: 'ls -a' will display all files, including hidden files.
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Q5. Write a command to replace a string in unix
Ans. 
Use the sed command to replace a string in Unix
• Use the following syntax: sed 's/original_string/new_string/g' filename

• The 's' flag stands for substitute, 'g' flag stands for global (replace all occurrences)

• Example: sed 's/hello/goodbye/g' file.txt
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About current project and roles and resposibilities etc

Q1. SQL COMPLEX QUERIES and PL SQL, CRON JOBS, SERVICE NOW
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Q2. What are difference between SQL and PL SQL
Ans. 
SQL is a standard language for managing relational databases, while PL/SQL is a procedural language extension for SQL.
• SQL is a standard language for querying and manipulating data in relational databases.

• PL/SQL is a procedural language extension for SQL, allowing for more complex programming logic.

• SQL is used for data manipulation and retrieval, while PL/SQL is used for writing stored procedures and functions.

• SQL state...read more
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Q3. Explain types of joins?
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Types of joins are used in databases to combine rows from two or more tables based on a related column between them.
• Inner Join: Returns rows when there is at least one match in both tables.

• Left Join (or Left Outer Join): Returns all rows from the left table and the matched rows from the right table.

• Right Join (or Right Outer Join): Returns all rows from the right table and the matched rows from the left table.

• Full Join...read more
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Q4. Diffence between correlated and non correlated subquary?
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Correlated subquery refers to a subquery that is dependent on the outer query, while non-correlated subquery can be executed independently.
• Correlated subquery is executed for each row processed by the outer query, while non-correlated subquery is executed only once.

• Correlated subquery is slower in performance compared to non-correlated subquery.

• Example: SELECT * FROM table1 WHERE column1 = (SELECT MAX(column2) FROM tab
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Q5. Find departement wise total sal?
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To find department wise total salary, sum up the salaries of employees in each department.
• Group employees by department

• Calculate total salary for each department

• Display department wise total salary
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Q1. What is quality.
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Quality is the measure of excellence or superiority of something.
• Quality is meeting or exceeding customer expectations.

• It involves consistency, reliability, and durability.

• Quality can be subjective and may vary depending on the context.

• Examples of quality in production engineering include precision machining, efficient processes, and reliable products.
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All questions in the maths , general knowledge, history

Q1. Personal information
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Q2. Ask u skills and clg projects
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Q3. Working experience and know u about company
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Q4. What u accept salary
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Q5. Wait for result
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Q1. What are your salary expectations?
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Q2. Share details of your previous job.
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Q3. Where do you see yourself in 5 years?
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Q4. What are your strengths and weaknesses?
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Q5. Tell me about yourself.
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Q1. Aiw?nnnnnnnnnnnnn? Mmmma q
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