Medium-HardAnalyzeSystem Design Interview FrameworkMultiple Choice
A system has 100K read QPS and 5K write QPS on a single PostgreSQL instance. Which scaling action addresses the bottleneck?
Analyze — Tests ability to break down and examine complex problems.
Answer Options
AAdd more application servers
BShard the database by user_id
CAdd Redis cache and read replicas to offload the 100K reads
DSwitch to MongoDB for its flexible schema
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