In
two tier model, Java Application communicates directly to the data
source. User commands are delivered to the database using JDBC driver
and results of those commands are sent back to the user. It is not
necessary that both Java application and data source in same machine.
They can reside anywhere.
The
major problem with two-tier model of jdbc is, it is fine when
concurrent number of users accessing your application are less. But
it is problematic, when number of users accessing your application
becomes more and more.
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