You configured a Cloud Spanner instance with instance_config = "nam3" but your app experiences high latency in Europe. What is the likely cause?

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GCP - Cloud SQL and Databases

You configured a Cloud Spanner instance with instance_config = "nam3" but your app experiences high latency in Europe. What is the likely cause?

AThe instance_config "nam3" is invalid and causes errors.

BYou need to increase the number of nodes to reduce latency.

CThe multi-region config "nam3" only covers North America, not Europe.

DCloud Spanner does not support multi-region configurations.

Step-by-Step Solution

Solution:

Step 1: Understand "nam3" coverage
"nam3" is a multi-region config limited to North America regions only.
Step 2: Analyze latency cause
High latency in Europe happens because data is not stored close to European users.
Final Answer:
The multi-region config "nam3" only covers North America, not Europe. -> Option C
Quick Check:
nam3 excludes Europe, causing latency there [OK]

Quick Trick: Check if multi-region config covers your app's user locations [OK]

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