[retinaros]

multi az brings multi complexity in terms of data duplication, consistency, if your app wasnt designed to handle those kind of scenarios and experience high users loads then you are in for a lot of problems.

designing for those scenarios increase complexity; cost; architecture style and most of the time it will bring you in microservices territory where most of the companies lack experience and just are following best practices in a field where engineers are expensive and few

[boomer918]

RDS just has a button for multi-AZ primaries. No complexity or microservices.

[retinaros]

ok lets say you have a master in one AZ and it dies. what happens?

[boomer918]

Automatic failover within 60 seconds.

[retinaros]

ok then what happened to your transactions that were in the middle of a process? the one that were commit only on one side?