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If a user at this company accesses an application in another, similarly structured company, the request will end up being processed by four issuers: The departmental issuer, which authenticates the user and supplies an e-mail name and some initial group claims The company s central issuer, which adds more groups and some roles based on those groups The application s central issuer, which maps roles from the user s company to roles that the application s company understands (this issuer may also add additional role-claims based on the ones already present) The application s departmental issuer, which maps roles onto actions You can see that as the request crosses each of these boundaries, the issuers there enrich and lter the user s security context by issuing claims that make sense for the target context, based on its requirements and the privacy policies.

12.4 User-Defined Types ...............................................................................................339

Creating User-Defined Types................................................................................................................ 339 Showing More Information with DESCRIBE .......................................................................................... 340

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

Is the e-mail name passed all the way through to the application That depends on whether the user s company trusts the application s company with that information, and whether the application s company thinks the application needs to know that information..

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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.

Now you are ready for the main document. At this stage, you should enter text only. You will insert your charts, tables, and graphs later. Also, avoid applying any formatting to the document. This includes bold, italics, and underline. You do not want to use indentation yet, nor should you use the Tab key to indent text. Right now, your primary concern is to enter the text data in your business plan. You will apply formatting to paragraphs and text in one stage. This ensures that you achieve clean, consistent formatting throughout the business plan. Use Word s Styles feature to apply the formatting, so Word will not retain manually applied formats.

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.

Change the table structure (with ALTER TABLE) Delete rows Execute stored functions or procedures Go back in time (with FLASHBACK TABLE) Create indexes on the table Insert new rows Create foreign key constraints to the table Query the table (or view) Change column values of existing rows

The Oracle DBMS allows you to group privileges into roles. Roles make user management much easier, more flexible, and also more manageable. The following are the corresponding SQL commands used to administer these privileges and roles: GRANT, to grant certain privileges or roles to users or roles REVOKE, to revoke certain privileges or roles from users or roles

There are, of course, many reasons why an application shouldn t get any more information about a user than it needs. Just two of them are compliance with privacy laws and the design practice of loose coupling.

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