Oracle Interview Questions
Practice 36 real Oracle interview questions for 2026. Real questions from actual interviews with detailed solutions — ideal for focused Oracle interview questions practice and interview preparation. This collection centers on Coding & Algorithms and System Design first, then Behavioral & Leadership, Software Engineering Fundamentals, and Machine Learning. Expect a coding-heavy loop: live pair-programming or online assessments that probe arrays, hashes, trees, graphs, and complexity; design rounds that evaluate scalability, APIs, and tradeoffs; and hiring-manager behavioral interviews that test ownership, prioritization, and cross-team impact. Software Engineer candidates should prioritize platform design and algorithm fluency: many questions here revolve around ride‑hailing and ride‑sharing system design, rate limiting, LRU cache implementation, course-completion/topological ordering, and a string/encoding frequency problem, plus behavioral deep dives on project ownership, failure handling, and applying patterns like Command or optimizing CLI tools. Data Scientist interviews at Oracle tend to focus on model evaluation and data issues — medical AI data and evaluation — and algorithmic grid problems such as counting closed or enclosed islands after flooding. Prepare with timed coding practice, mock design reviews, and concise STAR stories that highlight measurable impact.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Determine if robot path is bounded
Determine if robot path is bounded A robot starts at (0, 0) facing North on an infinite grid. It executes a string s consisting of 'G' (move forward 1...
Describe cross-team collaboration
Describe cross-team collaboration Behavioral & Leadership: Cross‑Team Collaboration (Onsite SWE) You are interviewing onsite for a Software Engineer r...
Extend and optimize an existing CLI tool
This question evaluates a candidate's ability to analyze an existing CLI codebase, perform gap analysis versus requirements, implement missing feature...
Count Enclosed Islands in a Grid
This question evaluates grid traversal and graph concepts such as connected-component detection, boundary-condition reasoning, and algorithmic time/sp...
Explain your project system design
Explain your project system design System Design Walkthrough: Project You Owned Context: In an onsite system design interview for a Software Engineer ...
Design scalable, highly available GenAI serving
System Design: Highly Scalable, Highly Available Generative AI Inference Platform Context Design a production-grade deployment for a generative AI tex...
Solve Five Coding Problems
This problem set evaluates proficiency in core algorithms and data structures, including graph traversal and connected-component identification, array...
Compute letter frequencies from encoded string
Problem You are given an encoded string s representing a string of lowercase English letters (a–z). The encoding follows these rules: 1. Letters a to ...
Count closed islands in a grid
This question evaluates grid traversal and connected-component detection skills, focusing on 4-directional adjacency and boundary-condition reasoning ...
Count Interior Islands After Flooding
You are given an m x n binary grid representing land and water. - 1 = land - 0 = water An island is a maximal group of land cells connected 4-directio...
Maximize area between vertical lines
This question evaluates algorithmic reasoning with arrays and the ability to optimize pairwise measurements, specifically assessing understanding of h...
Find users with at least one valid session
You are given: - A list of log entries logs, where each entry is a string in the format: ` "userId action timestamp" ` - userId is a non...
Implement an LRU cache
Design and implement an in-memory cache that evicts entries using the Least Recently Used (LRU) policy. The cache should store key–value pairs and sup...
Design structure for first unique login user
You are given an online stream of user login events. Each event is a user ID (e.g., an integer or string) indicating that this user has just logged in...
Minimize sum with halving operations
Minimize sum with halving operations You are given an array of non-negative integers nums and an integer k. In one operation, choose any index i and r...
Parse logs and query by time
Implement a parser that converts raw log lines into structured records with fields {timestamp, level, message}. Build an API to support: (a) insert(lo...