| ## How Updates Are Handled Updates are made to only one database, and the changes are propagated to all others. While propagations are pending, all replicas are accessible even if they are not completely up-to-date. In other words, even replicas to which the changes were not yet applied are available. This replication mechanism ensures that all replicas remain available for login validation and for read operations even when changes are in the process of being propagated. More: Master and Slave Replicas Handling Database Updates Propagating Database Changes Master/Slave Authentication ###