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

By Thomas Connolly, Carolyn Begg, Richard Holowczak

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

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As we have already noted, database integrity is usually expressed in terms of constraints, which are consistency rules that the database is not permitted to violate. Constraints may apply to data within a single record or they may apply to relationships between records. Again, data integration allows users to define, and the DBMS to enforce, integrity constraints. n Improved maintenance through data independence. Since a DBMS separates the data descriptions from the applications, it helps make applications immune to changes in the data descriptions.

Logical data independence refers to the immunity of the external schemas to changes in the conceptual schema. Physical data independence refers to the immunity of the conceptual schema to changes in the internal schema. n The DBMS provides controlled access to the database. It provides security, integrity, concurrency and recovery control, and a user-accessible catalog. It also provides a view mechanism to simplify the data that users have to deal with. n Some advantages of the database approach include control of data redundancy, data consistency, sharing of data, and improved security and integrity.

To start our discussion of database systems, we briefly examine some of their applications. For the purposes of this discussion, we consider a database to be a collection of related data and the Database Management System (DBMS) to be the software that manages and controls access to the database. We also use the term database application to be a computer program that interacts with the database in some way, and we use the more inclusive term database system to be the collection of database applications that interacts with the database along with the DBMS and the database itself.

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