architecture is the foundation of any database management system, which lets
the DBMS perform the functions efficiently and effectively. The whole
concept of DBMS revolves around its architecture. Depending upon the
architecture, database management systems are designed as centralized,
decentralized, and hierarchical.
The centralized DBMS design can
be correlated with the architecture of a simple computer system such as a
personal computer or laptop. The decentralized
DBMS design can be correlated with client-server architecture and hierarchical
DBMS can be correlated with n-Tier architecture.
architecture can be classified into three types as per the uses and
requirements of the users.
DBMS Architecture :
“level/layer”. The tier-1 architecture of DBMSs is the simplest among all,
which gives the user/developers the ability to let the communicate directly
to the database without any intervention of 3rd It also enables
the developers/users to make changes, manipulate and manage database
directly. This type of architecture is mainly used by developers for their
testing and data management purposes.
Cloud-based drives and Personal computer
systems can be possible examples of 1-Tier architecture.
architecture of DBMS consists of two tiers. Tier-1 is the database server
and Tier-2 being the users or clients of the application.
In this type of DBMS
architecture, the users of the software application deal with the database
software and can find their response to the requests made by them. The user
cannot manipulate the data inside the database without
can be a possible example of 2-Tier DBMS architecture.
architecture of DBMS is a fully-fledged software system that is responsible
for generating responses to user queries in the most efficient and suitable
architecture is the most complex among all three but solves almost all the
issues that occur in 2-Tier and 1-Tier architecture.
Security, Data Backup, Recovery, Concurrency
Control, and Low Data Redundancy are some of the features of a
3-Tier architecture, which makes it the most widely used database
The levels that are
used in 3-Tier DBMS architecture are:
Database Server(Tier-1): This
tier contains and deals with all the data and information. Also, it
guarantees that all the data is stored in a secured manner and there
might not occur a situation of data inconsistency or data
Application Layer(Tier-2): The
application layer acts as an intermediate between the User/Client
and the actual database. But it ensures to present the abstracted
view of the database and provides a way to respond to the queries
requested by the user by fetching the response from the database in
User/Client Layer(Tier-3): This
is the topmost layer from where users/clients can request data and
in response, the data is fetched from the database tier and passed
on to the user/client tier via the application layer in the most
meaningful way possible. It also provides the graphical user
interface(GUI) to the users.