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1.8 The Oracle Software Environment
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Oracle Corporation has its headquarters in Redwood Shores, California. It was founded in 1977, and it was (in 1979) the first vendor to offer a commercial RDBMS.
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The Oracle software environment is available for many different platforms, ranging from personal computers (PCs) to large mainframes and massive parallel processing (MPP) systems. This is one of the unique selling points of Oracle: it guarantees a high degree of independence from hardware vendors, as well as various system growth scenarios, without losing the benefits of earlier investments, and it offers extensive transport and communication possibilities in heterogeneous environments. The Oracle software environment has many components and bundling options. The core component is the DBMS itself: the kernel. The kernel has many important tasks, such as handling all physical data transport between memory and external storage, managing concurrency, and providing transaction isolation. Moreover, the kernel ensures that all stored data is represented at the logical level as relational tables. An important component of the kernel is the optimizer, which decides how to access the physical data structures in a time-efficient way and which algorithms to use to produce the results of your SQL commands. Application programs and users can communicate with the kernel by using the SQL language, the main topic of this book. Oracle SQL is an almost fully complete implementation of the ANSI/ISO/IEC SQL:2003 standard. Oracle plays an important role in the SQL standardization process and has done that for many years. Oracle also provides many tools with its DBMS, to render working with the DBMS more efficient and pleasurable. Figure 1-4 illustrates the cooperation of these tools with the Oracle database, clearly showing the central role of the SQL language as the communication layer between the kernel and the tools, regardless of which tool is chosen.
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Figure 1-4. Tools, SQL, and the Oracle database
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Note Besides tools enabling you to build (or generate) application programs, Oracle also sells many ready-touse application programs, such as the Oracle E-Business Suite and PeopleSoft Enterprise.
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The following are examples of Oracle software components: SQL Plus and SQL Developer: These two tools stay the closest to the SQL language and are ideal for interactive, ad hoc SQL statement execution and database access. These are the tools we will mainly use in this book. SQL Plus is a command line tool while SQL Developer is a graphical database administration and development tool.
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Note Don t confuse SQL with SQL Plus or SQL Developer. SQL is a language, and SQL Plus and SQL Developer are tools.
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Oracle Developer Suite: This is an integrated set of development tools, with the main components Oracle JDeveloper, Oracle Forms, and Oracle Reports. Oracle Enterprise Manager: This graphical user interface (GUI), which runs in a browser environment, supports Oracle database administrators in their daily work. Regular tasks like startup, shutdown, backup, recovery, maintenance, and performance management can be done with Enterprise Manager.
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1.9 Case Tables
This section introduces the seven case tables used throughout this book for all examples and exercises. Appendix A provides a complete description of the tables and also contains some helpful diagrams and reports of the table contents. s 3 and 7 contain the SQL commands to create the case tables (without and with constraints, respectively). You need some understanding of the structure of the case tables to be able to write SQL statements against the contents of those tables. Otherwise, your SQL statements may be incorrect.
Note You can download a script to create the case tables used in this book. Visit the book s catalog page at the Apress website, at the following URl: http://apress.com/book/view/1430271970. Then look in the Book Resources section on that page. You should see a download containing a script to create and populate the example schema for the book.
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