Application server has a heavy burden of operating
data. Because the management software of B/S
framework can only be installed on the server, the
network administrators just need to manage the server.
The main business logic of user-interface in the server are
achieved completely in WWW browser. Very few parts of
them are achieved in the front (Browser).All clients have
only browsers .The administrator just needs to do
hardware maintenance. But, the application server has a
burden of operating data, once it happens some problems
such as the server to go down. It will cause a serious
problem. So, many companies have equipped with
database server to be prepared for the worst.