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Yes, AWS is similar with their DB offerings. You can discourage it from doing any updates/reboots (which causes a failover), but ultimately if they want to failover, they can at any time.

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Ouch. If it knows it's about to fail over from an update, it really should get the follower totally in sync with the leader first.

HA on rds uses synchronous replication - you won’t lose data on automated failover under any normal circumstances.

Ok that's fine

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