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Doug Free Jersey , orders, and inventory Purchasing needs information about orders and inventory Collections needs information about members and their accounts Observe that no functional area needs all of the data Different portions are used by different functional areas Also note that some of the data is shared by two or more functional areas Member data, for example, is needed by Member Service, Order Processing
Tyrone Crawford Jersey , and Collections In a file processing system, each functional area would probably maintain its own file of Member records, resulting in terrible data duplication problems Also, it is likely that all copies of the MEMBER file would not be maintained precisely the same way, and so the data would likely soon disagree
Henry Melton Jersey , causing other problems In a database system, all the areas share the same centralized data It is precisely because centralized data can serve many functional areas that databases are so po[censored] r A database application is a business computer system that processes a portion of a database in order to meet the information needs of a business group, department, or functional area In a sense, an application provides a window into the database for a particular user group For now
Brandon Weeden Jersey , think of an application as a collection of computer screens, printed reports, and transaction processing programs that access the part of a database needed to solve problems for a user group Database processing systems are usually very large; after all, they support the needs of many diverse user groups Therefore, we divide database processing into separate applications First
Rolando McClain Jersey , recall that a business is usually divided into separate functional areas Thus, the computer screens, reports, and transaction processing programs for the Order Processing area are probably different from the computer screens, reports
Travis Frederick Jersey , and transaction processing programs for the Collections area When we develop applications, we incorporate the interfaces (screens and reports) needed by one group into a cohesive package Thus, for example, order entry clerks would see a computer screen format that was meaningful to them, while collections agents would see the style of computer screen they could best read and understand Second
Devin Street Jersey , database data is one of an organization's most valuable assets It is undesirable to allow every user to access every portion of the database Loan processing clerks in a bank, for example, should not be permitted to change savings account balances Breaking database processing into applications provides improved control over access to the data Finally, it is easier and less risky for developers to build applications one by one than to try to build them all at once Dividing processing into applications limits the scope of development to a series of smaller projects as opposed to one large projectKinds of Database SystemsDatabase systems are made up of five components: hardware, DBMS software and application programs
Demarcus Lawrence Jersey , the database itself, procedures, and people One way to classify database systems is according to the number of users and the number of applications they support This classification will affect each of the five components of the system For example, in a single-user database system, only one user at a time processes the database In contrast
Nick Hayden Jersey , multi-user database systems are processed concurrently by many users The hardware in a multi-user system is much more extensive than that of a single-user system Similarly, when databases are processed concurrently, special precautions need to be taken to prevent one user's processing from interfering with another's Thus, the DBMS software and user procedures for a single-user system are different from those of a multi-user one Database systems can also support one or many applications Combining these two dimensions, there are four basic types of database systems Single-user
Bruce Carter Jersey , single-application databases are most frequently found on microcomputers Multi-user, single-application databases are found on microcomputers connected via loc
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