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Always-On Databases: How Active-Active Replication Works Across Clouds

Ley Xiao
Ley Xiao
Published on April 7, 2026
10 minute read
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Key Takeaways
  • Cross-cloud active-active replication keeps both clouds serving production traffic simultaneously — when one provider goes down, there's no failover delay, no DNS switch, no lost transactions.
  • The three hard problems are loopback prevention (solved by origin-aware thread ID filtering), conflict detection (configurable per-table: overwrite, ignore, or record), and cross-cloud latency (solved by localizing sync components on each side).
  • This post covers the full architecture, compares active-active vs. primary-standby trade-offs, and walks through setup on OceanBase Cloud.
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