Why is replication between distant regions usually asynchronous?

Options

• ✗ Synchronous replication cannot cross regions
• ✓ Every commit would wait a cross-region round trip, often 50–150 ms Correct
• ✗ Asynchronous replication never loses data
• ✗ Regions use different database versions

Why

The price of async is a small window of writes that a regional failure can lose (the RPO). Systems that need zero loss across regions pay the latency, often with a nearby third region to keep it down.

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