Quick Answer
Zero-data-loss failover (RPO=0): use synchronous replication (synchronous_standby_names = "FIRST 1 (standby)") so every commit is confirmed on the standby before returning. Combine with Patroni for automated failover (promotes standby, reconfigures clients). Use synchronous_commit=remote_apply for the strictest guarantee. Monitor replication lag - alert if it exceeds 0. Test failover regularly to verify zero data loss.
Answer
Enable synchronous replication with quorum commit so primary waits for WAL confirmation from replicas. Use low-latency networks, fast disks, aggressive lag monitoring, and tuned synchronous_standby_names settings to guarantee RPO=0.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
