They use the database's replication API. In theory, it should avoid situations where the cache doesn't understand query syntax. But, what I'd worry about are s

They use the database's replication API. In theory, it should avoid situations where the cache doesn't understand query syntax. But, what I'd worry about are situations where an application needs to cache an object that's expensive to build. (And perhaps expensive to build because the programmer doesn't understand how to optimize SQL.)