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FGAC involves the following steps: 1. You create a policy function that will dynamically add a predicate to a user s DML statement. A predicate is the WHERE clause based on an operator (=, !=, IS, IS NOT, >, >=, EXIST, BETWEEN, IN, NOT IN, and so on). Here s an example of such a function: cust_no = (SELECT custno FROM orders WHERE custname = SYS_CONTEXT ('USERENV','SESSION_USER')) The package that implements your security policy will dynamically append a predicate to all SELECT statements on the ORDERS table, returning only those orders that pertain to the user s customer number (cust_no). 2. A user enters a statement such as the following: SELECT * FROM orders; 3. Oracle will use the policy function you created to dynamically modify the user s statement. For example, the statement in step 2 would be modified by the policy function in step 1 as follows: SELECT * FROM orders WHERE custno = ( SELECT custno FROM customers WHERE custname = SYS_CONTEXT('USERENV', 'SESSION_USER')) 4. Oracle uses the username returned by SYS_CONTEXT('USERENV', 'SESSION_USER') and executes the modified original query, thus limiting the data returned from the ORDERS table to that customer s data only.

This seems like common sense. If you are going to create an index on the columns C1 and C2 in a table with 100,000 rows, and you find C1 has 100,000 distinct values and C2 has 25,000 distinct values, you would want to create the index on T(C1,C2). This means that C1 should be first, which is the commonsense approach. The fact is, when comparing vectors of data (consider C1, C2 to be a vector), it doesn t matter which you put first. Consider the following example. We will create a table based on ALL_OBJECTS and an index on the OWNER, OBJECT_TYPE, and OBJECT_NAME columns (least discriminating to most discriminating) and also on OBJECT_NAME, OBJECT_TYPE, and OWNER: ops$tkyte@ORA10GR1> create table t 2 as 3 select * from all_objects; Table created. ops$tkyte@ORA10GR1> create index t_idx_1 on t(owner,object_type,object_name); Index created. ops$tkyte@ORA10GR1> create index t_idx_2 on t(object_name,object_type,owner); Index created. ops$tkyte@ORA10GR1> select count(distinct owner), count(distinct object_type), 2 count(distinct object_name ), count(*) 3 from t; DISTINCTOWNER DISTINCTOBJECT_TYPE DISTINCTOBJECT_NAME COUNT(*) ------------- ------------------- ------------------- -------28 36 28537 48243 Now, to show that neither is more efficient space-wise, we ll measure their space utilization: ops$tkyte@ORA10GR1> analyze index t_idx_1 validate structure; Index analyzed. ops$tkyte@ORA10GR1> select btree_space, pct_used, opt_cmpr_count, opt_cmpr_pctsave 2 from index_stats;

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Let s look at a simple example of FGAC. This FGAC implementation will use a policy that limits an employee to only seeing appropriate data in the employees table.

A related question is, How can I index a view Well, the fact is that a view is nothing more than a stored query. Oracle will replace the text of the query that accesses the view with the view definition itself. Views are for the convenience of the end user or programmer the optimizer works with the query against the base tables. Any and all indexes that could have been used if the query had been written against the base tables will be considered when you use the view. To index a view, you simply index the base tables.

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