Interview questionsStart free
Scaling & load balancingEasySDE-1
Your Postgres primary is at 90% CPU and 95% of queries are reads. A teammate proposes adding read replicas. When is this a good idea and what new problems does it bring?
Think first
Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.
Saved on this device. Create a free account to keep it on every device.
Practise this with Sam
A real mock interview, out loud, with an honest scorecard. Free to start.