Informatica Lead Engineer Interview Questions and Answers

Q1. Questions on jaxrs
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Q2. Questions on REST APIs
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Q1. Transaction in Spring Boot
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Transactions in Spring Boot help manage database operations as a single unit of work.
• Transactions ensure ACID properties (Atomicity, Consistency, Isolation, Durability) for database operations.

• Use @Transactional annotation to mark a method as transactional.

• Transactions can be managed programmatically using TransactionTemplate.

• Rollback can be triggered manually in case of exceptions.

• Spring Boot supports both declarative
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Q2. Java Array and problem solving
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Write java coding for solutions providesd?

Q1. What is sql? And what is use on select?
Ans. 
SQL is a programming language used for managing and manipulating databases. The SELECT statement is used to retrieve data from a database.
• SQL stands for Structured Query Language

• It is used to communicate with databases to perform tasks such as querying, updating, and deleting data

• The SELECT statement is used to retrieve data from a database

• Example: SELECT * FROM table_name WHERE condition;
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Q2. Diff between inner join and outer join?
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Inner join returns only the rows that have matching values in both tables, while outer join returns all rows from both tables.
• Inner join is used to retrieve rows from both tables that have matching values based on a specified condition.

• Outer join is used to retrieve all rows from both tables, with matching rows from both tables where available.

• Examples: Inner join - SELECT * FROM table1 INNER JOIN table2 ON table1.id =...read more
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Q1. Salary expectation
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Q2. Detail about roal
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Q1. OOPS hibernate
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Q2. String Angular javascript node js
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Q1. Work invironmet
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Collaborative, fast-paced, innovative work environment with emphasis on teamwork and continuous learning.
• Open communication and collaboration among team members

• Fast-paced and dynamic work environment

• Emphasis on innovation and creativity

• Teamwork and support for continuous learning and growth
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Q2. My thoughts ,what is work process
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Mostly Python based coding questions

Q1. SQL and python based questions
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Q2. Statistics questions as well
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Q1. Questions were mostly around system design, you will be given a case like a stock system and specific use case is asked to design end to end from UI to backend.
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Q2. Some of the system debugging/performance improvement questions are asked from both UI and backend.
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You can get the information and answer in Google

Q1. Xg boost, naive Bayes algorithm, standard deviation formula and detailed information about that
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Q2. What is xg boost All about naive Bayes algorithm Standard deviations and the formula
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Q3. What is the Byes rules and there in deep
Ans. 
Bayes' rule is a fundamental concept in probability theory that allows us to update our beliefs based on new evidence.
• Bayes' rule is named after Thomas Bayes, an 18th-century mathematician.

• It is also known as Bayes' theorem or Bayes' law.

• Bayes' rule calculates the probability of an event based on prior knowledge and new evidence.

• It is commonly used in machine learning and statistical inference.

• The formula for Bayes' ru...read more
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