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Advantages of Aurora global databases
Aurora global databases can provide you with the following advantages:
Secondary clusters provide scaling of reads far beyond the capacity of a single Aurora cluster.
A secondary cluster doesn't have a writer primary DB instance. This functionality means that it can have up to 16 read-only Aurora Replica instances, instead of the limit of 15 for a single Aurora cluster.
The replication performed by an Aurora global database has little performance impact on the primary DB cluster. The resources of the DB instances are fully devoted to serve application read and write workloads.
Changes are replicated between AWS Regions with minimal lag time, typically less than 1 second.
The secondary clusters enable fast failover for disaster recovery. You can typically promote a secondary cluster and make it available for writes in under a minute.
Applications in remote AWS Regions experience lower query latency when they read from a secondary cluster.