Process Operations in a Timestamped In-Memory Database
Last updated: August 22, 2026
Quick Overview
This question asks the candidate to implement operations for a timestamped in-memory database, focusing on CRUD operations and search functionalities based on keys, fields, and values.
Tradedesk
August 22, 20262
0
28 solved
This question asks the candidate to implement operations for a timestamped in-memory database, focusing on CRUD operations and search functionalities based on keys, fields, and values.
This question is typically asked in the online assessment round for software engineering candidates at Tradedesk to evaluate their coding skills and understanding of data structures. The interviewer aims to assess the candidate's ability to design an efficient in-memory database that can handle various operations and searches while considering performance and scalability.
What the Interviewer Expects
- Implement CRUD operations for the database.
- Design efficient search methods based on keys, fields, and prefixes.
- Incorporate timestamp and TTL (time-to-live) functionality.
- Utilize appropriate data structures for optimal performance.
- Provide clear and concise code with comments explaining the logic.
Key Topics to Cover
How to Approach This
- Clarify input constraints and edge cases before writing code.
- Walk through your approach verbally and confirm with the interviewer before coding.
- Start with a brute force solution, then optimize. Mention time and space complexity.
- Test your solution with examples, including edge cases like empty input or duplicates.
- Consider common patterns: sliding window, two pointers, hash map, BFS/DFS, dynamic programming.
Possible Follow-up Questions
- How would you handle concurrency in this database?
- What changes would you make to support persistence?
- Can you explain how you would optimize the search functionality further?
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Practice DSA ProblemsSample Answer
Approach
To implement a timestamped in-memory database, I will design a class that supports CRUD operations and search functionalities. The database will utilize nested maps to store key-field-value pairs alon...
Data Structure
I will use a nested dictionary in Python, where the outer dictionary's keys are the main keys, and the values are dictionaries that contain fields as keys and tuples of (value, timestamp, ttl) as valu...
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