What is the difference between Two Tier and Three Tier
Architecture?
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Answer Posted / ram
2-tier architecture
In 2-tier, the application logic is either buried inside
the User Interface on the client or within the database on
the server (or both). With two tier client/server
architectures (see Two Tier Software Architectures), the
user system interface is usually located in the user's
desktop environment and the database management services
are usually in a server that is a more powerful machine
that services many clients
3-tier architecture
In 3-tier, the application logic (or) process lives in the
middle-tier, it is separated from the data and the user
interface. 3-tier systems are more scalable, robust and
flexible. In addition, they can integrate data from
multiple sources. In the three tier architecture, a middle
tier was added between the user system interface client
environment and the database management server environment.
There are a variety of ways of implementing this middle
tier, such as transaction processing monitors, message
servers, or application servers. The middle tier can
perform queuing, application execution, and database
staging. For example, if the middle tier provides queuing,
the client can deliver its request to the middle layer and
disengage because the middle tier will access the data and
return the answer to the client
The most basic type of three tier architecture has a middle
layer consisting of Transaction Processing (TP) monitor
technology. The TP monitor technology is a type of message
queuing, transaction scheduling, and prioritization service
where the client connects to the TP monitor (middle tier)
instead of the database server. The transaction is accepted
by the monitor, which queues it and then takes
responsibility for managing it to completion, thus freeing
up the client.
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