Objectives of DBMS Ashima Wadhwa Session 4 Objectives of DBMS Ashima Wadhwa

Agenda of class: Objectives of DBMS Share ability Availability Evolve ability Adaptability Integrity Data Security Data Independence Redundancy Control Avoidance of Inconsistency

OBJECTIVES OF DBMS Share ability: An ability to share data resources is a fundamental objective of database management. In its fullest interpretation, this means different people and different processes using the same actual data at virtually the same time. Share ability advatages: Serving differently types of users with varying skill levels - Handling different user views of the same stored data. - Combining interrelated data - Setting standards - Controlling concurrent updates so as to maintain data integrity - Coordinating restart and recovery operations across multiple users.

Availability: Availability means bringing the data of an organization to the users of that data. They system which manages data resources should be easily accessible to the people within n organization – making the data available when and where it is needed, and in the manner and form in which it is needed. Availability refers to both the data and the DBMS which delivers the data. Availability functions make the database available to users: defining and creating a database, and getting data in and out of a database. These are the direct functions performed by a DBMS. A DBMS should accommodate diversity in the data stored.

Evolve ability: Evolve ability refers to the ability of the DBMS to change in response to growing user needs and advancing technology. Evolve ability is the system characteristic that enhances future availability of the data resources. A system exhibiting adaptive behavior actively seeks a particular state or goal by changing itself in response to a change in itself or its environment. Evolvability implies the gradual unfolding, development and growth of a system to better meet the needs of the using environment: and it implies change of the system in response to changing needs and technology

Adaptability : Adaptability is a more advanced form of evolve ability in which built in algorithms enable a system to change itself, rather than having a change made to it. Adaptability involves purposive, self organizing, or self controlling behavior, that is, self regulation toward a single criterion of success: ultimate, long-term survival.

Integrity: The importance and pervasiveness of the need to maintain database integrity is rooted in the reality that man is perfect. Destruction, errors and improper disclosure must be anticipated and explicit mechanisms provided for handling them. The three primary facets of database integrity are:- protecting the existence of the database Maintaining the quality of the database Ensuring the privacy of the database. In Database management system, data in database is stored in tables. A single database contains multiple tables and relationships can be created between tables (or associated data entities). This makes easy to retrieve and update data.

Data Security : Form is very important object of DBMS. You can create forms very easily and quickly in DBMS. Once a form is created, it can be used many times and it can be modified very easily. The created forms are also saved along with database and behave like a software component which are password protected.

Data Independence : The separation of data structure of database from the application program that uses the data is called data independence. In DBMS, you can easily change the structure of database without modifying the application program.

Redundancy Control : In non-database systems each application program has its own private files. In this case, the duplicated copies of the same data is created in many places. In DBMS, all data of an organization is integrated into a single database file. The data is recorded in only one place in the database and it is not duplicated.

Avoidance of Inconsistency : By controlling the data redundancy, the data consistency is obtained. If a data item appears only once, any update to its value has to be performed only once and the updated value is immediately available to all users. If the DBMS has controlled redundancy, the database system enforces consistency.

Thank You !!