Advantages of DBMS

 One of the main advantages of using a
database system is that the organization can
exert, via the DBA, centralized management
and control over the data. The database
administrator is the focus of the centralized
control. Any application requiring a change
in the structure of a data record requires an
arrangement with the DBA, who makes the
necessary modifications. Such modifications
do not affect other applications or users of the
record in question.

Reduction of Redundancies: Centralized
control of data by the DBA avoids
unnecessary duplication of data and
effectively reduces the total amount of data
storage required. It also eliminates the extra
processing necessary to trace the required
data in a large mass of data.

Elimination of Inconsistencies: The main
advantage of avoiding duplication is the
elimination of inconsistencies that tend to be
present in redundant data files. Any
redundancies that exist in the DBMS are
controlled and the system ensures that these
multiple copies are consistent.

Shared Data: A database allows the sharing of
data under its control by any number of
application programs or users. For example,
the applications for the public relations and
payroll departments can share the same data.

Integrity: Centralized control can also ensure
that adequate checks are incorporated in the
DBMS to provide data integrity. Data
integrity means that the data contained in the
database is both accurate and consistent.
Therefore, data values being entered for the
storage could be checked to ensure that they
fall within a specified range and are of the
correct format.

Security: Data is of vital importance to an
organization and may be confidential. Such
confidential data must not be accessed by
unauthorized persons. The DBA who has the
ultimate responsibility for the data in the
DBMS can ensure that proper access
procedures are followed, including proper
authentication schemes for access to the
DBMS and additional checks before
permitting access to sensitive data. Different
levels of security could be implemented for
various types of data and operations.

Conflict Resolution: Since the database is
under the control of the DBA, he/she should
resolve the conflicting requirements of
various users and applications. In essence, the
DBA chooses the best file structure and access
method to get optimal performance for the
response-critical applications, while
permitting less critical applications to
continue to use the database, albeit with a
relatively slower response.

Data Independence: Data independence is
usually considered from two points of view:
physical data independence and logical data
independence.
Physical data independence allows changes in the
physical storage devices or organization of the files
to be made without requiring changes in the
conceptual view or any of the external views and
hence in the application programs using the
database. Thus, the files may migrate from one
type of physical media to another or the file
structure may change without any need for changes
in the application program.

Logical data independence implies that
application programs need not be changed if
fields are added to an existing record; nor do they
have to be changed if fields not used by
applications programs are deleted. Logical data
independence indicates that the conceptual
schema can be changed without affecting the
existing external schemas.
Data Independence is advantageous in the database
environment since it allows for changes at one
level of the database without affecting other
levels. These changes are absorbed by the
mapping between the levels. Advantages of
DBMS…

Advantages of DBMS

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Advantages of DBMS