Question 907 of 1,446
PCDE Practice Question: Manage a solution that can span multiple database technologies
A Cloud Bigtable instance experiences a sudden increase in read latency and request errors. The operations team notices that one node is handling disproportionately more traffic. Which tool should they use to diagnose the issue?
⚠ Common exam trap
A common mistake is to choose Cloud Monitoring (formerly Stackdriver) because it shows aggregate latency and error metrics, but it does not pinpoint which row keys are causing the hotspot. Key Visualizer is the specialized tool for analyzing access patterns by row key range.
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
✓
Key Visualiser
Key Visualizer is the correct tool because it provides a heatmap of access patterns across row key ranges, allowing you to identify hot spots where a single node is overloaded due to uneven key distribution. This directly addresses the symptom of one node handling disproportionately more traffic, which is a common cause of increased latency and errors in Cloud Bigtable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Key Visualiser
Why this is correct
Key Visualiser is designed to identify hot spots by visualising read/write patterns across key ranges.
- ✗
Stackdriver Monitoring dashboard
Why it's wrong here
Stackdriver Monitoring shows aggregate metrics but does not provide per-key hot spot analysis.
- ✗
gcloud bigtable instances describe
Why it's wrong here
This command shows instance configuration, not traffic patterns.
- ✗
Use the cbt command to scan the table
Why it's wrong here
cbt can read data but does not provide hot spot analysis.
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Same concept, more angles
1 more way this is tested on PCDE
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A large enterprise uses Cloud Bigtable for analytics. They notice that some nodes are handling significantly more traffic than others, causing hot spots and performance degradation. Which tool should they use to identify the specific row keys causing the issue?
hard- ✓ A.Bigtable Key Visualiser
- B.Stackdriver Error Reporting
- C.Bigtable cbt tool with read rows command
- D.Cloud Monitoring dashboard for Bigtable
Why A: Key Visualiser is a Bigtable tool that provides a heatmap of row key access patterns, helping to identify hot spots by showing which row key ranges are heavily accessed.
Last reviewed: Jul 4, 2026
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