Optimize a production Cloud Spanner instance to reduce cost while keeping high reliability. What should you use to determine safe reductions in processing units?
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Correct answer: Use Cloud Monitoring to monitor the CPU utilization, and reduce Spanner processing units by small increments until you find the minimum capacity required..
Why this is the answer
Cloud Monitoring is the correct tool because it provides metrics like CPU utilization, which directly indicate the load on your Cloud Spanner instance. High CPU utilization suggests the instance is busy, while consistently low utilization indicates over-provisioning. By gradually reducing processing units and observing CPU utilization, you can find the optimal balance between cost and performance without sacrificing reliability. Cloud Logging focuses on errors, not performance metrics. Cloud Trace is for distributed tracing and latency analysis, not overall resource utilization. Snapshot Debugger is for debugging application code, not for monitoring database resource usage.
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