Answer Posted / vamsee

in app server u will diffine that connect to which data
base according to that connection will be establised and u
can get data from data base.if the data base is not working
then u will get a error page(related to database).
if u want to give 100% availability for clint then u can
use failover concept and place the data in to different
databases and give instructions for u r application that if
one data base is fail to serve the data after partucular
time the request will rediirect to another database where
data is present.

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