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Conventions in Code Examples Code examples illustrate SQL, PL/SQL, SQL*Plus, or other command-line statements. They are displayed in a monospace (fixed-width) font and separated from normal text as shown in this example: SELECT username FROM dba_users WHERE username = ’MIGRATE’; The following table describes typographic conventions used in code examples and provides examples of their use. Convention Meaning Example [] Brackets enclose one or more optional items. Do not enter the brackets. DECIMAL (digits [ , precision ]) {} Braces enclose two or more items, one of {ENABLE | DISABLE} which is required.

For more information on what software to install, see "Identifying Your Oracle Database Software Release" on page 1-8. See Also: For specific requirements and instructions for installation, refer to the following documentation: ■ ■ Your operating system specific Oracle documentation Your installation guides for your front-end tools and Oracle Net drivers. Task 3: Plan the Database As the database administrator, you must plan: ■ The logical storage structure of the database ■ The overall database design ■ A backup strategy for the database It is important to plan how the logical storage structure of the database will affect system performance and various database management operations.

Security enhancements are an important part of this release. Applications have available more and finer grained methods of implementing security and auditing. The following are summaries of the new features of Oracle9i that are discussed in this book. ■ Online redefinition of tables The new DBMS_REDEFINITION PL/SQL package provides a mechanism to redefine tables online. When a table is redefined online, it is accessible to DML during much of the redefinition process. This provides a significant increase in availability compared to traditional methods of redefining tables that require tables to be taken offline.

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