Name:Shah Rushabh J
 Branch:Computer Engg.(3rd D)
 Enrollment:130460107066
Sub:Database mangement System
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History of DBMS
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Database management systems (DBMSs) have played an outsized
role in the history of software development and in the creation
and growth of the software products industry. Recognizing the
major role played by these products, the Annals is publishing two
special issues on the subject.
These two issues will be the fourth and fifth sponsored by the
Software Industry Special Interest Group of the Computer History
Museum (formerly the Software History Center).
This issue (the first) is focused on the products, companies, and
people who designed, programmed, and sold mainframe DBMS
software products beginning in the 1960s and 1970s. The second
issue will be devoted to the relational DBMS products, which were
developed during the 1970s and came to prominence (and some
say dominance) during the 1980s and 1990s.
Advantages and Disadvantages of Database
Management System (DBMS)
A DBMS offers several advantages over filing systems in
which data appearing in separate files are not
interrelated and centrally managed.
Better information
Because data are integrated in a database environment,
information that otherwise might be difficult or
impossible to pull together can be collected.
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Faster Response time
Since data are integrated into a single database,
complex request can be handled much more quickly.
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Lower Operating Cost
Since response time is faster, users can do more work in less
time.
Lower Storage Requirement
In a database system, integration often means that the same data
need not appear over and over again in separate files, thereby
saving valuable disk space.
Improved Data Integrity
In a database system, integration often means that a data update
need be made in only one place to be reflected throughout the
system automatically – thereby avoiding the error that is often
introduced when the same update has to be made manually in
several independent files.
Better Data Management
Central storage in a single database gives a DBMS better control
over the data dictionary, security and standards.
Disadvantages
Database processing also has a down side that a
company or an individual should consider. The
major problem is cost.
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Database software
Relative to other types of file-management software, a
DBMS is expensive.
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New Hardware
A DBMS often requires a great deal of memory and secondary
storage, and accessing records can be time consuming. Some
users find it necessary to upgrade to a bigger, more powerful
computer system.
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Training
PC-based database management systems are often more
difficult to master then spreadsheets or word processors.
Relating data in different files can be tricky and users who
want to custom-design their own applications with
programming language facility must prepare for a
substantial investment in learning time.
Increase in system’s vulnerability
Cost is not the only problem. Because the data in the
database is highly integrated, a problem with a key
element might render the whole system inactive.
Despite the disadvantages, however, DBMSs have become
immensely popular with both organizations and individuals.