Get Active Database Systems: Triggers and Rules for Advanced PDF

By Jennifer Widom

ISBN-10: 1558603042

ISBN-13: 9781558603042

Active database structures improve conventional database performance with strong rule-processing functions, offering a uniform and effective mechanism for lots of database approach functions. between those functions are integrity constraints, perspectives, authorization, data collecting, tracking and alerting, knowledge-based platforms, specialist platforms, and workflow administration. this important assortment specializes in the main well-known examine initiatives in lively database structures. The undertaking leaders for every prototype approach offer specific discussions in their tasks and the relevance in their effects to the way forward for energetic database structures. * A wide assessment of present lively database structures and the way they are often prolonged and greater * A entire creation to the middle issues of the sector, together with its motivation and historical past * assurance of lively database (trigger) functions in advertisement items * dialogue of coming near near criteria

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Extra info for Active Database Systems: Triggers and Rules for Advanced Database Processing

Sample text

First, however, we categorize the different types of people who work in a database system environment. 1, one person typically defines, constructs, and manipulates the database, and there is no sharing. However, in large organizations, many people are involved in the design, use, and maintenance of a large database with hundreds of users. In this section we identify the people whose jobs involve the day-to-day use of a large database; we call them the actors on the scene. 5 we consider people who may be called workers behind the scene—those who work to maintain the database system environment but who are not actively interested in the database contents as part of their daily job.

2 Insulation between Programs and Data, and Data Abstraction In traditional file processing, the structure of data files is embedded in the application programs, so any changes to the structure of a file may require changing all programs that access that file. By contrast, DBMS access programs do not require such changes in most cases. The structure of data files is stored in the DBMS catalog separately from the access programs. We call this property program-data independence. 2. No_of_columns STUDENT 4 COURSE 4 SECTION 5 GRADE_REPORT 3 PREREQUISITE 2 COLUMNS Column_name Data_type Belongs_to_relation Name Character (30) STUDENT Student_number Character (4) STUDENT Class Integer (1) STUDENT Major Major_type STUDENT Course_name Character (10) COURSE Course_number XXXXNNNN COURSE ….

Availability of Up-to-Date Information. A DBMS makes the database available to all users. As soon as one user’s update is applied to the database, all other users can immediately see this update. This availability of up-to-date information is essential for many transaction-processing applications, such as reservation systems or banking databases, and it is made possible by the concurrency control and recovery subsystems of a DBMS. Economies of Scale. The DBMS approach permits consolidation of data and applications, thus reducing the amount of wasteful overlap between activities of data-processing personnel in different projects or departments as well as redundancies among applications.

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Active Database Systems: Triggers and Rules for Advanced Database Processing by Jennifer Widom


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