Amazon RDS Master-Slave Relationship between EC2 instances with load balancing activated?

You have to take a few things into consideration.

When RDS is used in multi-az mode you have no access to the secondary instance. There is only ever one instance that is visible to you, so most if your question doesn't apply. In case of failover the DNS address you are given will start resolving to a different ip.

Amazon doesn't disclose how the two instances are kept in sync.

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