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Chapter 11 Oracle Fine Grained Auditing

      handler_module  => 'EMAILER'

Here a procedure named EMAILER, owned by SECUSER, is defined as the handler module. When the audit condition is satisfied on the table, the procedure EMAILER is automatically called. Imagine this as a trigger on the select statement. Ordinarily, triggers are based on some transactional statements such as insert, update, delete, etc.; but this is an example where the concept of triggers can be extended to the select statements, too.

The handler functions are useful in many cases. In the above definition, we can place some logic inside the procedure EMAILER to check other conditions, such as coming from a specific IP Address, and generating emails to alert someone on possible unauthorized access.

An important point to note here is that the handler procedure may be defined in another schema, not necessarily in the same one as that of the table. This ability is particularly well suited for secured applications since no user need be given execute privilege on this procedure, and hence no user can call this procedure independently to create serious damage.

The ability of the handler procedure to execute when an audit condition is satisfied can be exploited by creating a user-defined audit functionality as shown later in this chapter.

Multiple Policies

A table may have several FGA policies defined on it. All the policies are independently evaluated and handled. For all the policies in which the conditions evaluate to
 

The above text is an excerpt from:

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