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Part of planning to test is formalizing your plans in writing. To find further information on test documentation, refer to the Additional Resources section at the end of 32.

SQL offers several commands to implement data security and to restrict data access. First of all, access to the database must be defined. User authorization is implemented by providing database users a login name and a password, together with some database-wide privileges. These are the most important commands in this area: CREATE USER, to define new database users ALTER USER, to change properties (privileges and passwords) of existing database users DROP USER, to remove user definitions from the database

8

One key to effective testing is planning from the beginning of the project to test. Putting testing on the same level of importance as design or coding means that time will be allocated to it, it will be viewed as important, and it will be a highquality process. Test planning is also an element of making the testing process repeatable. If you can t repeat it, you can t improve it.

Retesting (Regression Testing)

If users are authorized to access the database, you can implement fine-grained data access by granting specific privileges. The Oracle DBMS offers two types of privileges: system privileges and object privileges. System privileges pertain to the right to perform certain (nonobject-related) actions; for example, you can have the CREATE SESSION privilege (allows you to log on to the database) and the CREATE TABLE privilege. Oracle supports approximately 140 different system privileges. Object privileges involve the right to access a specific database object in a specific way; for example, the right to issue SELECT, INSERT, and UPDATE commands against the EMPLOYEES table. Table 2-2 lists the most important Oracle object privileges.

automatically cropping photos to t the space. But here on the Explanation slides, if you want exibility beyond just photographs, choose Content, as shown in Figure 8-14 this will allow you to insert a range of types of content on the slides where you apply this layout. Alternatively, you don t have to use a placeholder at all in your custom layout in that case, you can later add graphics manually to your slides.

Suppose that you ve tested a product thoroughly and found no errors. Suppose that the product is then changed in one area and you want to be sure that it still passes all the tests it did before the change that the change didn t introduce any new defects. Testing designed to make sure the software hasn t taken a step backwards, or regressed, is called regression testing. One survey of data-processing personnel found that 52% of those surveyed weren t familiar with this concept (Beck and Perkins 1983). That s unfortunate because it s nearly impossible to produce a high-quality software product unless you can systematically retest it after changes have been made. If you run different tests after each change, you have no way of knowing for sure that no new defects have been introduced. Consequently, regression testing must run the same tests each time. Sometimes new tests are added as the product matures, but the old tests are kept too.

The only practical way to manage regression testing is to automate it. People become numbed from running the same tests many times and seeing the same test results many times. It becomes too easy to overlook errors, which defeats the purpose of regression testing. Test guru Boriz Beizer reports that the error rate in manual testing is comparable to the bug rate in the code being tested. He estimates that in manual testing, only about half of all the tests are executed properly (Johnson 1994). Here are some of the benefits of test automation:

Note Granting and revoking system privileges is typically a task for database administrators. See Oracle SQL Reference, part of the official documentation set for the Oracle Database, for more details on both system and object privileges.