rs.
  Servers that track changes in the master are called <I
CLASS="FIRSTTERM"
>standby</I
>
  or <I
CLASS="FIRSTTERM"
>slave</I
> servers. A standby server that cannot be connected
  to until it is promoted to a master server is called a <I
CLASS="FIRSTTERM"
>warm
  standby</I
> server, and one that can accept connections and serves read-only
  queries is called a <I
CLASS="FIRSTTERM"
>hot standby</I
> server.
 </P
><P
>  Some solutions are synchronous,
  meaning that a data-modifying transaction is not co