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Relational technology provides a way of sharing data among different applications, or among different technologies that form parts of the same application (the transactional engine and the reporting engine, for example) Relational technology is a common denominator of many disparate systems and technology platforms Hence, the relational data model is often the common enterprise-wide representation of business entities Relational database management systems have SQL-based application programming interfaces; hence, we call today s relational database products SQL database management systems or, when we re talking about particular systems, SQL databases Before we go into more detail about the practical aspects of SQL databases, we have to mention an important issue: Although marketed as relational, a database system providing only an SQL data language interface isn t really relational and in many ways isn t even close to the original concept Naturally, this has led to confusion.

Figure 10-6

Managing and Troubleshooting Disks and Volumes 10-13

With the functional specification completed, the managers of the planning team assign teams to create detailed plans for the following elements of the Deliver phase:

SQL practitioners blame the relational data model for shortcomings in the SQL language, and relational data management experts blame the SQL standard for being a weak implementation of the relational model and ideals Application developers are stuck somewhere in the middle, with the burden to deliver something that works We ll highlight some important and significant aspects of this issue throughout the book, but generally we ll focus on the practical aspects If you re interested in more background material, we highly recommend Practical Issues in Database Management: A Reference for the Thinking Practitioner by Fabian Pascal (Pascal, 2000)..

6. Click OK. Mounted volume paths have a different icon in Windows Explorer, as shown in Figure 10-7, and are represented by the <JUNCTION> identifier when viewed at a command prompt, as shown in Figure 10-8.

Figure 10-7

To use Hibernate effectively, a solid understanding of the relational model and SQL is a prerequisite. You need to understand the relational model and topics such as normalization to guarantee the integrity of your data, and you ll need to

Figure 10-8

The following list contains some additional information about drive letters and paths:

use your knowledge of SQL to tune the performance of your Hibernate application Hibernate automates many repetitive coding tasks, but your knowledge of persistence technology must extend beyond Hibernate itself if you want to take advantage of the full power of modern SQL databases Remember that the underlying goal is robust, efficient management of persistent data Let s review some of the SQL terms used in this book You use SQL as a data definition language (DDL) to create a database schema with CREATE and ALTER statements After creating tables (and indexes, sequences, and so on), you use SQL as a data manipulation language (DML) to manipulate and retrieve data The manipulation operations include insertions, updates, and deletions You retrieve data by executing queries with restrictions, projections, and join operations (including the Cartesian product) For efficient reporting, you use SQL to group, order, and aggregate data as necessary.

You cannot assign multiple drive letters to a single volume. You cannot assign the same drive letter to multiple volumes on the same computer. You can mount a volume into multiple paths simultaneously. A volume can exist without a drive letter or mount path assigned; however, the volume will not be accessible by applications.

10-14

You can even nest SQL statements inside each other; this technique uses subselects You ve probably used SQL for many years and are familiar with the basic operations and statements written in this language Still, we know from our own experience that SQL is sometimes hard to remember, and some terms vary in usage To understand this book, we must use the same terms and concepts, so we advise you to read appendix A if any of the terms we ve mentioned are new or unclear If you need more details, especially about any performance aspects and how SQL is executed, get a copy of the excellent book SQL Tuning by Dan Tow (Tow, 2003) Also read An Introduction to Database Systems by Chris Date (Date, 2003) for the theory, concepts, and ideals of (relational) database systems.

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