What is a recommended action to ensure 99.999% database availability for a global application?

Creating a multi-regional Cloud Spanner instance with the "nam-asia-eur1" configuration is a robust strategy for achieving high availability, specifically 99.999% availability, for a global application. This approach leverages Cloud Spanner's ability to replicate data across multiple geographic locations, ensuring that even if one region encounters an outage or becomes unavailable, the application can still function seamlessly.

The "nam-asia-eur1" configuration distributes the database across multiple regions in North America, Asia, and Europe, which significantly enhances fault tolerance and uptime. With this setup, Cloud Spanner maintains multiple active replicas of data, providing redundancy and allowing for automatic failover to a healthy instance in the event of a regional failure. This distribution ensures that new writes can be processed from different locations, minimizing latency for users regardless of their geographic location.

In contrast, other options may not provide the same level of availability or geographic distribution. For example, having only a single multi-regional configuration like the "nam3" instance or simply clustering nodes together might not offer the same redundancy and geographic separation needed for high resilience. Furthermore, setting up multiple instances in separate regions is beneficial, but the combination of that with an integrated multi-regional setup would be