New PDF release: Business Database Systems

By Thomas Connolly, Carolyn Begg, Richard Holowczak

ISBN-10: 1405874376

ISBN-13: 9781405874373

Business Database platforms arms you with the information to examine, layout and enforce powerful, strong and profitable databases.  This booklet is perfect for college students of Business/Management info platforms, or desktop technology, who might be anticipated to take a direction in database platforms for his or her measure programme. it's also excellently suited for any practitioner who must examine, or refresh their wisdom of, the necessities of database administration platforms.

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Sample text

Many organizations still maintain a manual file to store external correspondence relating to a project, product, task, client, or employee. Typically, they have many such files and, for safety, they are labeled and stored in one or more cabinets. For security, the cabinets may have locks or may be located in secure areas. To look something up in such a system, we start from the first entry and search until we find what we want. Alternatively, we may have an index that helps locate what we want more quickly.

9 Possible file-based system for StayHome Online Rentals them. This means that changes to an existing structure are difficult, requiring a change and rebuild of all the application programs that access the file. It also usually involves the writing of a throw-away piece of software that converts the file from the old structure to the new structure and modifying the structure of the content of each record accordingly. Clearly, this could be very timeconsuming and subject to error. This characteristic of file-based systems is known as program–data dependence.

It also allows records to be located through key values. Although not essential, network systems generally implement set relationships by means of pointers that directly address the location of a record on disk. This gives excellent retrieval performance at the expense of operations such as database loading and reorganization. The most popular network DBMS is now Computer Associates’ IDMS/R. The hierarchical and network approaches represented the first-generation of DBMSs. These two approaches have some fundamental disadvantages: n n n complex programs have to be written to answer even simple queries based on navigational record-at-a-time access; there is minimal data independence so that applications are not protected from changes to data formats; there is no widely accepted theoretical foundation.

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Business Database Systems by Thomas Connolly, Carolyn Begg, Richard Holowczak

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