Understanding the Objectives of Database Management in an Organization
Motivators are problems
an organization faces while objectives are the desirable end results
stemming from a solution to those problems. An expression of objectives
serves to focus attention on the needs of the using environment and
the system and administrative requirements for meeting those needs.
Some objectives of database management derive directly from the assumed
context of organizations and management information systems. The objectives
of shareability, availability, evolvability and integrity are briefed
This list indicates some of the additional problems which arise in managing shared data. A central implication of sharing is that compromise will often be required between conflicting user needs as, for example, in the establishment of a data structure and corresponding storage structure.
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.
refers to the ability of the DBMS to change in response to growing user
needs and advancing technology. Evolvability is the system characteristic
that enhances future availability of the data resources. Evolvability
is not the same as expandability or extensibility, which imply extending
or adding to the system, which then grows ever larger. Evolvability
covers expansion or contraction, both of which may occur as the system
changes to fit the ever changing needs and desires of the using environment.
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:
In developing DBMSs, the accountants concept of internal control has been practically ignored. Computer specialists need such concepts to improve database integrity and enhance management confidence.
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