Oracle Principal Engineer Interview Questions and Answers

Programming questions on matrix and array.

Q1. System design on copying a file from backup.
Ans. 
Design a system for copying a file from backup
• Consider the size of the file and available bandwidth for efficient transfer

• Implement error checking and retry mechanisms to ensure data integrity

• Use parallel processing to speed up the copying process

• Consider implementing deduplication to save storage space

• Ensure proper access controls and encryption for security
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Q1. General questions on cultural fitment
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Q1. Fibonacci all possible solution and optimisation
Ans. 
Fibonacci sequence can be solved using recursion, iteration, or memoization for optimization.
• Recursion: Implement a function that calls itself with the previous two numbers in the sequence.

• Iteration: Use a loop to calculate each Fibonacci number based on the previous two numbers.

• Memoization: Store the results of previous calculations to avoid redundant calculations.

• Example: Fibonacci(5) = Fibonacci(4) + Fibonacci(3) = ...read more
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Q1. Multi thread deadlock and odd even
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Q1. 2 pointer problem for sum of number
Ans. 
Given an array of integers, find two numbers that add up to a specific target number.
• Use a hashmap to store the difference between the target number and each element in the array.

• Iterate through the array and check if the current element's complement exists in the hashmap.

• Return the indices of the two numbers that add up to the target number.
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Longest palindrome in a string

Level order traversal of Binary tree

Q1. Design payments infrastructure
Ans. 
Designing a robust and scalable payments infrastructure for efficient transactions.
• Identify the requirements of the payments system, including transaction volume, security, and integration with existing systems.

• Choose appropriate payment methods such as credit/debit cards, digital wallets, and bank transfers.

• Implement secure payment gateways to process transactions securely and efficiently.

• Consider compliance with regu...read more
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Q1. Sql based questions like different queries etc, primarily interested in knowing how you try to reach towards solution, and presence of mind
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Q2. Projwct specific things, erp related questuons
Ans. Explain what you know , what you did and what was your role. Honest cv and answers are welcome.
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Q3. Few process related Agile, jira Sdlc Stlc, Devops
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Q1. Ctc expectations etc. Hiring manager round
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