Database Concurrency & Scaling interview question
A viral post's like counter makes requests slow. How do you handle hot rows?
The answer is available to members. Create a free account to see every answer, track which questions you're confident about and practise with timed mock interviews.
More most-asked Database Concurrency & Scaling questions
- How do you prevent overselling in a flash sale with 50,000 buyers in the first minute?
- After a deploy, logs show hundreds of 'deadlock detected' errors per hour on checkout. Walk through how you'd investigate.
- Two customers buy the last item at the same moment and both orders are confirmed. What happened, and how do you prevent it?
- Your service throws 'connection pool exhausted' errors but database CPU is only 20%. What's going on?
- Why shouldn't you call a payment API inside a database transaction?
- What's the difference between Read Committed and Repeatable Read in practice?
- Database CPU is at 85%. How do you decide what to optimise before buying a bigger server?
- A user saves their profile and the next page shows the old data. Reads go to replicas. How do you fix it?