Internally, HAC uses a set of HotStandby commands (HotStandby API) to control
the server states. A solution such as this allows implementation of systems that
have increased reliability. A failed database server no longer brings your site to a
complete halt. In as little as a few hundred milliseconds, in any engine
configuration supported by solidDB (such as solidDB advance replication with
master and replica servers), HotStandby allows the secondary database to replace
the failed one.