Oracle interview questions

2,471 questions from 241 candidate reports · 2012 to 2025

Online test → Technical → Technical → Technical → HR·82% entry level

CS fundamentals

Showing 21 of 1,578 reported in this area

Explain ACID properties in DBMS

asked 10×easyPractice this →

Explain different types of SQL joins

asked 6×easyPractice this →

Explain the four pillars of Object-Oriented Programming.

asked 6×easyPractice this →

What are the differences between C++ and Java?

asked 5×easyPractice this →

Explain Paging in Operating Systems

asked 4×mediumPractice this →

What is Object-Oriented Programming?

asked 3×easyPractice this →

Explain the Software Development Life Cycle (SDLC).

asked 3×easyPractice this →

What is static binding and dynamic binding?

asked 2×mediumPractice this →

Explain normalization in DBMS with examples.

asked 2×mediumPractice this →

What is the difference between 3NF and BCNF?

asked 2×mediumPractice this →

Explain SQL injection and how it can be prevented

asked 2×mediumPractice this →

Explain the significance of the volatile keyword in Java.

asked 2×mediumPractice this →

Write SQL queries to retrieve data from relational tables

asked 2×mediumPractice this →

Explain database normalization and different normal forms.

asked 2×mediumPractice this →

Explain the difference between multithreading and multiprocessing.

asked 2×mediumPractice this →

Basic SQL queries

asked 2×easyPractice this →

Explain the OSI model layers

asked 2×easyPractice this →

Compare TCP and UDP protocols

asked 2×easyPractice this →

Explain Java Collections framework

asked 2×easyPractice this →

Difference between calloc and malloc?

asked 2×easyPractice this →

Explain the concept of Virtual Memory.

asked 2×easyPractice this →

DSA

Showing 27 of 1,016 reported in this area

Reverse a singly linked list

asked 9×easyPractice this →

Check whether a given number is prime

asked 6×easyPractice this →

Find the intersection point of two linked lists

asked 5×mediumPractice this →

Find the diameter of a binary tree.

asked 4×mediumPractice this →

Detect and remove a loop in a linked list

asked 4×mediumPractice this →

Detect a loop in a linked list

asked 4×easyPractice this →

Print the left view of a binary tree.

asked 3×mediumPractice this →

Given a string, find the longest palindromic substring.

asked 3×mediumPractice this →

Find the Lowest Common Ancestor (LCA) of two nodes in a binary tree.

asked 3×mediumPractice this →

Reverse a linked list

asked 3×easyPractice this →

Merge two sorted linked lists

asked 3×easyPractice this →

Implement stack using a linked list

asked 3×easyPractice this →

Check whether a given string is a palindrome

asked 3×easyPractice this →

Check whether a given string or number is a palindrome.

asked 3×easyPractice this →

Check whether two given strings are anagrams of each other.

asked 3×easyPractice this →

Group the anagrams from a list of strings

asked 2×mediumPractice this →

Add Two Numbers Represented by Linked Lists

asked 2×mediumPractice this →

Print all root-to-leaf paths in a binary tree.

asked 2×mediumPractice this →

Convert an infix expression to a postfix expression.

asked 2×mediumPractice this →

Convert a sorted array into a balanced Binary Search Tree

asked 2×mediumPractice this →

Find the Longest Increasing Subsequence in a given array.

asked 2×mediumPractice this →

Explain Quick Sort algorithm

asked 2×easyPractice this →

Sort an array of 0s, 1s and 2s

asked 2×easyPractice this →

Find the height of a binary tree

asked 2×easyPractice this →

Reverse a number using recursion.

asked 2×easyPractice this →

Reverse the words in a given string

asked 2×easyPractice this →

Print all prime numbers from 1 to n.

asked 2×easyPractice this →

Puzzles

Showing 3 of 192 reported in this area

Minimum cut puzzle.

asked 2×hardPractice this →

Find the fastest 3 horses puzzle

asked 2×hardPractice this →

Find the fastest 3 horses out of 25 horses using minimum number of races.

asked 2×hardPractice this →

Aptitude

Showing 3 of 189 reported in this area

Aptitude and logical reasoning questions

asked 4×easyPractice this →

Basic English grammar and spell check questions

asked 2×easyPractice this →

Grammar correction, sentence reordering, reading comprehension, vocabulary and word replacement questions

asked 2×easyPractice this →

System design

Showing 3 of 94 reported in this area

Design a distributed job scheduler.

asked oncemediumPractice this →

Low-level design of a Task Scheduler

asked oncemediumPractice this →

High-level design of a Task Scheduler

asked oncemediumPractice this →

Behavioural

Showing 3 of 54 reported in this area

How would you handle a stressful situation at work?

asked oncemediumPractice this →

What would you do if a team member is not contributing to work?

asked oncemediumPractice this →

How would you handle a difficult team member in a project setting?

asked oncemediumPractice this →

Showing 60 of 2,471 questions. Ranked by how often the same question came back across reports.

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Common questions

What questions does Oracle ask?

Candidate interview reports most often cover CS fundamentals (51%) and DSA (33%).

How many rounds does Oracle interview have?

Candidate interview reports show an average of 4.1 rounds per experience, with a typical sequence of Online test → Technical → Technical → Technical → HR. Individual interview paths can vary.

Is the Oracle interview hard?

Among questions with a reported difficulty, the mix is easy 44%, medium 50%, hard 6%.

Oracle interview questions

CS fundamentals

DSA

Puzzles

Aptitude

System design

Behavioural

Practise a Oracle-style interview

Common questions

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