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The DBMS provides all the basic services required to organize and maintain the database, including the following: Moving data to and from the physical data les as needed. Managing concurrent data access by multiple users, including provisions to prevent simultaneous updates from con icting with one another. Managing transactions so that each transaction s database changes are an all-or-nothing unit of work. In other words, if the transaction succeeds, all database changes made by it are recorded in the database; if the transaction fails, none of the changes it made are recorded in the database. Note that some relational DBMSs lack support for transactions. Support for a query language, which is the system of commands that a database user employs to retrieve data from the database. SQL is the primary query language used with relational DBMSs and the primary topic of this book. Provisions for backing up the database and recovering the database from failures. Security mechanisms to prevent unauthorized data access and modi cation.

The Sun Java System Application Server is a J2EE-compliant platform for deploying enterprise Java applications, in conjunction with existing CGI and Netscape Server API (NSAPI) applications By integrating all server-side application support under a single service regime, it is possible to minimize administration overhead, achieve better scaling through tight integration, and provide combined monitoring and event notification support Historically, server-side applications providing back-end and middleware services have used front-end presentation layers, in the form of HTML pages, JSP pages, applets, and applications to give users combined access to numerous data sources By implementing business logic using the J2EE model, you can avoid the pitfalls associated with multiprocess applications, such as those written for use with Web servers that support CGI, by using Java s multithreading capabilities Enterprise JavaBeans (EJBs) are one of the key technologies supported by J2EE.

With Pandora you can design your own unique radio stations built around artists you like. Best of all, it is completely free! Start by downloading the Pandora app from the App Store. Just go to the App Store and search for Pandora. Now just touch the Pandora icon to start.

These distributed components are of three varieties: Stateless session beans Store data and perform operations that are not stateful Stateful session beans Store data and perform operations that are stateful Entity beans Allow object operations to be easily mapped onto relational database tables By using stateful session beans to support user sessions, entity beans to persist data, and stateless session beans to provide a low-overhead interface to entity beans, you can build entire applications on the EJB infrastructure While the myriad layers and parameters associated with an EJB deployment can be mind-boggling, fortunately the Sun Java System Application Server provides advanced deployment tools to ease and automate many aspects of this process By implementing a distributed object platform, server-side applications can be expanded to span across multiple servers and clusters, improving scalability and reducing bottlenecks The relationships between the various layers of EJB technology are shown in Figure 33-1.

Although most Java application servers support the J2EE specification, given the wide variety in licensing costs, it s important to understand what features set the Sun Java System Application Server apart from the competition..

A relational database is a database based on the relational model, which was developed by Dr. E. F. Codd. The relational model presents data in familiar twodimensional tables, much like a spreadsheet does. Unlike a spreadsheet, the data is not necessarily stored in tabular form, and the model also permits combining (joining, in relational terminology) tables to form views, which are also presented as twodimensional tables. It is the ability to use tables independently or in combination with others without any prede ned hierarchy or sequence in which the data must be accessed that makes relational databases highly exible.

The first time you start Pandora, you ll be asked to either create an account or to sign in if you already have an account. Just fill in the appropriate information an email address and a password are required and you can start designing your own music listening experience.

Part VI:

FIGURE 33-1

Pandora is also available for your Windows or Mac computer and for most smartphone platforms. If you already have a Pandora account, all you have to do is sign in.