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You can think of an application context as a named set of variable=value pairs that are specific to a session. Once you create the package (HR_CONTEXT) that helps set the application context, you can go ahead and create the application context itself as follows. Note that the hr user uses the package just created in the previous section to create the employee_info application context. SQL> CONNECT system/system_passwd; Connected. SQL> GRANT CREATE ANY CONTEXT TO hr; Grant succeeded. SQL> CONNECT hr/hr; Connected. SQL> CREATE CONTEXT employee_info USING hr.context; Context created. SQL> You can set the application context for a user in two ways. The first is to implement an application context by itself, without fine-grained access control. To do this, you just create an event trigger on a user s logon so the user will invoke the SELECT_EMP_NO procedure belonging to the HR_CONTEXT package upon logging into the database. Here s how you create the logon trigger to set the initial context for a user: SQL> CREATE OR REPLACE TRIGGER hr.security_context 2 AFTER LOGON ON DATABASE 3 BEGIN 4 hr_context.select_emp_no; 5* END; SQL> / Trigger created. SQL> The preceding logon trigger uses the SELECT_EMP_NO procedure of the HR_CONTEXT package you created to grab the user s employee_id and store it in the emp_num variable. The second way to set or reference an application context is to do so as an integral part of VPD, using a policy function implementing fine-grained access control. The following section discusses this in detail.

Virtually every application I work on seems to have some text associated with it, XML to be dealt with, or images to be stored and categorized The interMedia set of functionality, implemented using the Application Domain Indexing feature, provides these capabilities As time passes, the set of available index types grows We ll take a more in-depth look at the text index in a subsequent chapter..

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Traditionally, security policies were applied to entire applications. Users were given roles or privileges, based on which they could access the tables in the application. This always left open the possibility of users using tools such as SQL*Plus to go around the application s security protocols and modify data in the database tables. Furthermore, application-level security enforcement meant you had to manage a grant/revoke policy for each user in the system for access to all the tables in the database. There are situations where you might want to limit access to an application s data to certain segments of users. Of course, you could create views to such a thing, but managing views poses several problems, such as maintenance and auditing usage. Fine-grained access control enables you to restrict Oracle users so that they can only use the data you want them to access and modify. FGAC is facilitated through the use of policy functions, which you attach to the tables or views you want to secure. It uses dynamically modifiable statements to restrict or limit users to certain portions of a table, view, or synonym. When a user s SQL statements are parsed, FGAC makes Oracle automatically evaluate the policy functions (you can attach more than one policy to a table). Oracle will execute the user s query after dynamically modifying the query if necessary.

This demonstration highlights two points: Space is reused on index blocks as soon as a row comes along that can reuse it. When an index block is emptied, it can be taken out of the index structure and may be reused later. This is probably the genesis of this myth in the first place: blocks are not visible as having free space on them in an index structure as they are in a table. In a table, you can see blocks on the freelists, even if they have data on them. In an index, you will only see completely empty blocks on the freelists; blocks that have at least one index entry (and remaining free space) will not be as clearly visible.

FGAC enables you to implement fine-grained data security. You can enforce a row-level security policy using this feature.

As I said in the introduction to this book, I field lots of questions about Oracle. I am the Tom behind the Ask Tom column in Oracle Magazine and at http://asktom.oracle.com, where I answer people s questions about the Oracle database and tools. In my experience, the topic of indexes attracts the most questions. In this section, I answer some of the most frequently asked questions. Some of the answers may seem like common sense, while other answers might surprise you. Suffice it to say, there are lots of myths and misunderstandings surrounding indexes.

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