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A typical scenario is the following: CREATE ROLE <role name> GRANT privileges TO <role name> GRANT <role name> TO user(s) The first step creates a new (empty) role. The second step (which can be repeated as many times as you like) populates the role with a mix of object and system privileges. The third step grants the role (and thereby all its privileges) to a user in a single step. Roles have several useful and powerful properties: Roles are dynamic; further changes to the role contents automatically affect all users previously granted that role. Roles can be enabled or disabled during a session. You can protect roles with a password. In that case, only users who know the role password can enable the role. The most important advantage of roles is their manageability.

If you cite outside sources in your business plan, it is important to credit them properly with footnotes. Word automates the process so the numbering is always correct. If you make changes to the document, you don t need to worry about the placement of the footnotes. To insert a footnote, place the cursor where you want to position the footnote mark. Then click Insert Reference Footnote. In the Location section in the Footnote and Endnote dialog box, select Footnotes and specify Bottom of page, as shown in Figure 2-8. Click Insert.

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Each table has an owner, the user who created the table. Table owners are able to grant privileges on their tables to other database users using the GRANT command. As soon as you create a table, you implicitly get all object privileges on that table, WITH GRANT OPTION, as illustrated in Figure 2-3, which shows the syntax of the GRANT command.

Note System privileges and roles are not considered in Figure 2-3, so the syntax diagram is incomplete.

To remind you of what you ve learned, here s a summary of the bene ts that claims can bring you. Claims decouple authentication from authorization so that the application doesn t need to include the logic for a speci c mode of authentication. They also decouple roles from authorization logic and allow you to use more nely-grained permissions than roles might provide. You can securely grant access to users who might have previously been inaccessible because they were in different domains, not part of any corporate domain, or using different platforms or technologies. Finally, you can improve the ef ciency of your IT tasks by eliminating duplicate accounts that might span applications or domains and by preventing critical information from becoming stale.

Figure 2-3. The GRANT command syntax diagram Here are some comments about the GRANT command: Table owners cannot grant the right to remove a table (DROP TABLE) to other database users. Note, however, that Oracle supports a (rather dangerous) DROP ANY TABLE system privilege. If you want to grant all object privileges to someone else, you can use the keyword ALL (see Figure 2-3). (Instead of ALL PRIVILEGES, the Oracle DBMS also allows you to specify ALL.) With a single GRANT command, you can grant privileges to a single user, a list of users, a role, or all database users. You can address all database users with the pseudo-user PUBLIC (see Figure 2-3). The UPDATE privilege supports an optional refinement: this privilege can also be granted for specific columns, by specifying column names between parentheses. In principle, there is no difference between tables and views when granting object privileges; however, the privileges ALTER, INDEX, and REFERENCES are meaningless in the context of views. The GRANT OPTION not only grants certain object privileges, but also grants the right to the grantee to spread these privileges further.

Figure 2-4. The REVOKE command syntax diagram Besides the two standard SQL commands mentioned in this section (GRANT and REVOKE), Oracle supports several additional commands in the security and data access area; for example, to influence the locking behavior of the DBMS, to implement auditing, and to set up more detailed user authorization.

Word will insert the footnote mark at the selected location and take you to the footnote section at the bottom of the page (see Figure 2-9). There, you can enter the footnote text. Add formatting as you would for any other portion of your document.

This section discusses the following topics: Constants (literals) Variables Operators, operands, conditions, and expressions Functions Database object names Comments Reserved words

Constants (Literals)

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