pmpkiran

The weekly maintenance window you define for Amazon RDS is just a place holder.It does not mean that maintenance happens every week. It only happens when there are specific security or MyQL patches that need to be applied and is pre-announced in the forums.The maintenance window could also be used to schedule instance scaling events, during which, like you pointed out, there would be downtime. However, the downtime would be limited to the instance fail over time (typically less than 3 minutes) if you use a Multi-AZ deployment.