By Ramez Elmasri, Shamkant B. Navathe
This can be the booklet of the broadcast e-book and should now not comprise any media, site entry codes, or print vitamins that can come packaged with the certain booklet. transparent reasons of concept and layout, large assurance of types and genuine structures, and an updated advent to fashionable database applied sciences bring about a number one creation to database structures. meant for desktop technology majors, basics of Database structures, 6/e emphasizes math versions, layout concerns, relational algebra, and relational calculus. A lab handbook and difficulties supply scholars possibilities to perform the basics of layout and implementation. Real-world examples function enticing, sensible illustrations of database strategies. The 6th version keeps its assurance of the preferred database issues, together with SQL, defense, and information mining, and contours elevated emphasis on XML and semi-structured information.
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Notice that we can apply similar controls to the DBMS software. For example, only the dba’s staff may be allowed to use certain privileged software, such as the software for creating new accounts. Similarly, parametric users may be allowed to access the database only through the predefined canned transactions developed for their use. 3 Providing Persistent Storage for Program Objects Databases can be used to provide persistent storage for program objects and data structures. This is one of the main reasons for object-oriented database systems.
Alternatively, the recovery subsystem could ensure that the transaction is resumed from the point at which it was interrupted so that its full effect is recorded in the database. Disk backup is also necessary in case of a catastrophic disk failure. We discuss recovery and backup in Chapter 23. 6 Providing Multiple User Interfaces Because many types of users with varying levels of technical knowledge use a database, a DBMS should provide a variety of user interfaces. These include query languages for casual users, programming language interfaces for application programmers, forms and command codes for parametric users, and menu-driven interfaces and natural language interfaces for standalone users.
For example, consider the names, telephone numbers, and addresses of the people you know. You may have recorded this data in an indexed address book or you may have stored it on a hard drive, using a personal computer and software such as Microsoft Access or Excel. This collection of related data with an implicit meaning is a database. The preceding definition of database is quite general; for example, we may consider the collection of words that make up this page of text to be related data and hence to constitute a database.