Your question is Optimizing Slow Database Queries. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Describe a time you had to optimize a slow-performing database query.
Explain how you diagnosed the bottleneck, evaluated possible solutions, coordinated with relevant stakeholders, and validated the improvement. Be prepared to discuss trade-offs, rollout safety, and how you monitored the result after deployment.