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Oracle interview questions

41 questions19 coding4 system design18 behavioral9 freeUpdated

This is every question in the Oracle guide, in one list: 19 coding problems, 4 system designs and 18 behavioral questions, drawn from what candidates report about Oracle interviews.

Each row shows the round it comes from and links to the lesson that works through it. 9 are free to read in full. The other 32 are Premium, and here you still see their round, difficulty and topic, so you know what you're walking into.

Open the Oracle guide Unlock all 41

Oracle coding interview questions

19 problems, in the order the guide teaches them. Each lesson gives the full problem, a worked solution and the follow-ups interviewers tend to add.

1Group Anagrams: Bucket by SignatureFreeMediumArrays, Strings & Hashing
2Two Sum: Complement in One PassFreeEasyArrays, Strings & Hashing
3Longest Consecutive Sequence: Set MembershipFreeMediumArrays, Strings & Hashing
4Longest Substring Without Repeating Characters: Sliding WindowFreeMediumArrays, Strings & Hashing
5Minimum Window Substring: Shrink to FitFreeHardArrays, Strings & Hashing
6Meeting Rooms II: Minimum RoomsFreeMediumStacks & Intervals
7Merge Intervals: Sort Then SweepFreeMediumStacks & Intervals
8Asteroid Collision: A Stack of SurvivorsFreeMediumStacks & Intervals
9Premium medium problemMediumTrees & BSTs
10Premium medium problemMediumTrees & BSTs
11Premium medium problemMediumTrees & BSTs
12Premium medium problemMediumGraphs, Grids & DP
13Premium medium problemMediumGraphs, Grids & DP
14Premium medium problemMediumGraphs, Grids & DP
15Premium medium problemMediumGraphs, Grids & DP
16Premium medium problemMediumData Structure Design
17Premium medium problemMediumData Structure Design
18Premium easy problemEasySQL, Java & Concurrency
19Premium medium problemMediumSQL, Java & Concurrency

Oracle system design interview questions

4 designs, each worked end to end in its own lesson, from requirements to the architecture and its trade-offs.

#Question
1LLD: Thread-Safe CacheFree
2Distributed Job Scheduler (Premium)
3Concurrent Booking System (Premium)
4DB-Backed Sharded Service (Premium)

A lock means the design is named here and its walkthrough is Premium.

Oracle behavioral interview questions

18 questions, grouped by what the interviewer is testing. The lesson explains why each one gets asked and what a strong answer covers.

Why Oracle & motivation (4)

All 4 are Premium

Failure & learning (4)

All 4 are Premium

Conflict (3)

All 3 are Premium

Customer impact & deadline pressure (4)

All 4 are Premium

Leadership & mentoring (3)

All 3 are Premium

Read the Oracle behavioral questions

See all 41 Oracle questions by name

Premium opens the 32 locked questions on this page, each with the full prompt and a worked answer, and every other lesson in all 100 company guides.

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Common questions

How many questions are in the Oracle interview guide?

41: 19 coding problems, 4 system designs and 18 behavioral questions. The guide was last updated in November 2026.

Which rounds do these Oracle interview questions come from?

All 19 coding problems come from the coding rounds. The 4 system designs and 18 behavioral questions come from the system design and behavioral rounds. Every row in the list carries its round, so you can start with the one you have booked.

Which Oracle interview questions are free?

9 of the 41 are free to read in full, marked Free in the list. The other 32 come with Premium, which also opens all 100 company guides.