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Oracle allows you to label parts of your data, and users can be granted privileges to access data with certain labels. Security policies are implemented on a single column, which represents the label. The Oracle Label Security feature (based on the older Trusted Oracle security product) is built on the same components that help you create a VPD. You can easily construct labels to limit access to rows in a certain table, and use label authorizations and privileges to set up a label-based security policy. The Oracle Policy Manager GUI is mainly designed to create and administer Oracle Label Security policies.

If you satisfy all three criteria, feel free to skip the index it is not needed and will slow down DML on the child table. If you do any of the three, be aware of the consequences. As a side note, if you believe that a child table is getting locked via an unindexed foreign key and you would like to prove it (or just prevent it in general), you can issue the following: ALTER TABLE <child table name> DISABLE TABLE LOCK; Now, any UPDATE or DELETE to the parent table that would cause the table lock will receive the following: ERROR at line 1: ORA-00069: cannot acquire lock -- table locks disabled for <child table name> This is useful in tracking down the piece of code that is doing what you believe should not be done (no UPDATEs or DELETEs of the parent primary key), as the end users will immediately report this error back to you.

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Row Source Operation --------------------------------------------------SORT AGGREGATE (cr=145168 pr=0 pw=0 time=2251857 us) INDEX RANGE SCAN T_IDX_2 (cr=145168 pr=0 pw=0 time=1382547 us)(object...

Just because you have set up a sophisticated system of access controls using privileges, roles, views, and even fine-grained security policies doesn t guarantee that database security won t be breached. Auditing database usage lets you know whether your access control mechanisms are indeed working as designed. Auditing involves monitoring and recording (selected) users database activity. Oracle s built-in auditing features allow you to track the changes made to database objects. You can audit the granting of privileges within the database, as well as non-DML and non-DDL changes, such as database startup and shutdown events. Auditing user activity can potentially lead to a large amount of data to keep track of, but fortunately, Oracle offers you a lot of control over what type of activities you want to audit. You can audit just at the session level or at the entire database level. Oracle makes a broad distinction between standard auditing and fine-grained auditing. Standard auditing is based on statement-, privilege-, and object-level auditing. Fine-grained auditing deals with data access at a granular level, with actions based on content, such as value > 100,000. I discuss standard auditing first, and then fine-grained auditing.

Oracle Database 11g lets you audit database use at three different levels: statement, privilege, and object. A statement-level audit specifies the auditing of all actions on any type of object. For example, you can specify that the database audit all actions on tables by using the AUDIT TABLE statement. A privilege-level audit tracks actions that stem from system privileges. You can audit all actions that involve the use of a granted privilege, such as auditing all CREATE ANY PROCEDURE statements. Finally, an object-level audit monitors actions such as UPDATE, DELETE, and INSERT statements on a specific table, so you could audit all DELETEs on the hr_employees table. For each of the three levels of auditing, you can choose to audit either by session or by access. If you audit by session, Oracle will log just one record for all similar statements that fall under the purview of auditing. If you audit by access, Oracle writes a record for each access. You can also decide to log only whether a certain action failed or succeeded by using the WHENEVER SUCCESSFUL and the WHENEVER NOT SUCCESSFUL auditing options. When the operation is unsuccessful, it s usually an indication that the user doesn t have privileges to perform the operation. You ll want to know who is attempting such unauthorized operations.

There are many possible causes of this. In this section, we ll take a look at some of the most common.

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