Design innovative, scalable, and highly available cloud database solutions →hardMultiple ChoiceObjective-mapped
PCDE Practice Question: Design innovative, scalable, and highly available cloud database solutions
You need to estimate the number of Bigtable nodes required for a workload of 50,000 reads per second (QPS) and 20,000 writes per second. Each node can handle 10,000 QPS for reads or writes. Storage is not a constraint. What is the minimum number of nodes required?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
5 nodes
Reads require 50,000/10,000 = 5 nodes. Writes require 20,000/10,000 = 2 nodes. The higher value is the bottleneck, so 5 nodes are needed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
2 nodes
Why it's wrong here
Insufficient for read throughput.
- ✗
7 nodes
Why it's wrong here
Over-provisioned; 5 nodes are sufficient.
- ✓
5 nodes
Why this is correct
5 nodes provide 50,000 QPS read and 50,000 QPS write, meeting both requirements.
- ✗
10 nodes
Why it's wrong here
Unnecessarily high.
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