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The question of whether or not foreign keys should be indexed comes up frequently. We touched on this subject in 6 Locking and Latching when discussing deadlocks. There, I pointed out that unindexed foreign keys are the biggest single cause of deadlocks that I encounter, due to the fact that an update to a parent table s primary key or the removal of a parent record will place a table lock on the child table (no modifications to the child table will be allowed until the statement completes). This locks many more rows than it should and decreases concurrency. I see it frequently when people are using a tool that generates the SQL to modify a table. The tool generates an UPDATE statement that updates every column in the table, regardless of whether or not the value was modified. This, in effect, updates the primary key (even though they never changed the value). For example, Oracle Forms will do this by default, unless you tell it to just send modified columns over to the database. In addition to the table lock issue that might hit you, an unindexed foreign key is bad in the following cases as well:

Row Source Operation --------------------------------------------------SORT AGGREGATE (cr=145133 pr=0 pw=0 time=2334197 us) INDEX RANGE SCAN T_IDX_1 (cr=145133 pr=0 pw=0 time=1440672 us)(object...

The column-level VPD policy kicks into action when it sees that the salary column is referenced in a query, and the policy function implementing the column-level security policy returns the predicate WHERE salary ='my_salary', thus transforming the query as follows: SQL> SELECT fname, lname, salary FROM employees WHERE salary = 'my_salary';

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When you have an ON DELETE CASCADE and have not indexed the child table. For example, EMP is child of DEPT. DELETE FROM DEPT WHERE DEPTNO = 10 should cascade to EMP. If DEPTNO in EMP is not indexed, you will get a full table scan of EMP. This full scan is probably undesirable, and if you delete many rows from the parent table, the child table will be scanned once for each parent row deleted. When you query from the parent to the child. Consider the EMP/DEPT example again. It is very common to query the EMP table in the context of a DEPTNO. If you frequently query

When you access a table, Oracle looks up the application context (the policy context) to determine which policy group, and therefore which security policy, should be enforced. There is one default policy group called SYS_DEFAULT that can never be dropped from the database, and every policy belongs to this group by default.

******************************************************************************** SELECT /*+ INDEX( t t_idx_2 ) */ COUNT(*) FROM T WHERE OBJECT_NAME = :B3 AND OBJECT_TYPE = :B2 AND OWNER = :B1 call count ------- -----Parse 1 Execute 48243 Fetch 48243 ------- -----total 96487 Rows ------48243 57879 cpu elapsed disk query current -------- ---------- ---------- ---------- ---------0.00 0.00 0 0 0 11.00 10.78 0 0 0 1.87 2.10 0 145168 0 -------- ---------- ---------- ---------- ---------12.87 12.88 0 145168 0 rows ---------0 0 48243 ---------48243

You can use the Oracle Policy Manager GUI, an extension to Oracle Enterprise Manager, to administer Oracle Label Security (discussed next) as well as to create VPD security policies. Oracle Policy Manager will help you effortlessly create application contexts and complex security policies to enforce fine-grained data security. This definitely beats creating application contexts and security policies manually. When you use OEM to create a VPD policy, you create an application context and provide the table (or view or synonym) name, the policy name, the function name that generates the predicate, and the statement types to which the policy applies (SELECT, INSERT, UPDATE, or DELETE). Oracle Policy Manager executes the DBMS_RLS.ADD_POLICY function to create the FGAC policy to support your VPD.

select * from dept, emp where emp.deptno = dept.deptno and dept.dname = :X; to generate a report or something, you ll find not having the index in place will slow down the queries. This is the same argument I gave for indexing the NESTED_COLUMN_ID of a nested table in 10. The hidden NESTED_COLUMN_ID of a nested table is nothing more than a foreign key. So, when do you not need to index a foreign key In general, when the following conditions are met: You do not delete from the parent table. You do not update the parent table s unique/primary key value, either purposely or by accident (via a tool). You do not join from the parent table to the child table, or more generally, the foreign key columns do not support an important access path to the child table and you do not use them in predicates to select data from this table (such as DEPT to EMP).

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