Advantages of DBMS

Apr 6, 2016Download as PPTX, PDF6 likes9,077 views

The document discusses several key advantages of using a database management system (DBMS) including centralized management of data by a database administrator (DBA), reduction of data redundancies, elimination of inconsistencies, shared access to data by multiple applications, ensuring data integrity, security of confidential data, resolving conflicts between user/application requirements, and data independence which allows changes to the physical storage or logical schema without affecting applications.

 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…

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Advantages of DBMS

1. By: V Harshith Singh 1618

2.  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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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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