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You choose this type by setting the POLICY_TYPE parameter to DBMS_RLSSHARED_CONTEXT_SENSITIVE You can add a security policy to a database by using the DBMS_RLS package (RLS stands for row-level security) provided by Oracle This package enables you to administer security policies, which means you can add and drop policies, policy groups, or application contexts You provide the name of the table, view, or synonym for which you want the security policy to apply, as well as the security policy for implementing the FGAC You also specify the particular types of SQL statements the policy applies to, such as a SELECT, INSERT, UPDATE, DELETE, CREATE INDEX, or ALTER INDEX statement Here are the main procedures of the DBMS_RLS package: DBMS_RLSADD_POLICY: Adds a policy to a table, view, or synonym DBMS_RLSCREATE_POLICY_GROUP: Creates a policy group DBMS_RLS.

ops$tkyte@ORA10GR1> analyze index t_idx_2 validate structure; Index analyzed. ops$tkyte@ORA10GR1> select btree_space, pct_used, opt_cmpr_count, opt_cmpr_pctsave 2 from index_stats; BTREE_SPACE PCT ----------- -----2702744 89.0 OPT_CMPR_COUNT OPT_CMPR_PCTSAVE -------------- ---------------1 13

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T_IDX) violated The new (NULL, NULL) row is not considered to be the same as the old row with (NULL, NULL): ops$tkyte@ORA11GR2> select x, y, count(*) 2 from t 3 group by x,y 4 having count(*) > 1; X Y COUNT(*) ---------- ---------- ---------2 This seems impossible; our unique key isn t unique if we consider all Null entries The fact is that, in Oracle, (NULL, NULL) is not the same as (NULL, NULL) when considering uniqueness the SQL standard mandates this (NULL,NULL) and (NULL,NULL) are considered the same with regard to aggregation, however The two are unique for comparisons but are the same as far as the GROUP BY clause is concerned That is something to consider: each unique constraint should have at least one NOT NULL column to be truly unique.

ADD_POLICY_CONTEXT: Adds the context for the application You create the security policy using the DBMS_RLSADD_POLICY procedure, as shown here: SQL> CONNECT system/system_passwd Connected SQL> EXECUTE dbms_rlsadd_policy('hr','employees','manager_policy','hr','hr_securityempnum_sec','select'); PL/SQL procedure successfully completed Note that you could also have executed the preceding statement in the following equivalent manner: SQL> 2 3 4 5 6 7 BEGIN dbms_rlsadd_policy (object_schema => 'hr', object_name => 'employees', policy_name => 'manager_policy', function_schema => 'hr', policy_function => 'hr_securityempnum_sec',.

The question that comes up with regard to indexes and Null values is, Why isn t my query using the index The query in question is something like the following: select * from T where x is null; This query cannot use the index we just created the row (NULL, NULL) simply is not in the index, hence the use of the index would return the wrong answer Only if at least one of the columns is defined as NOT NULL can the query use an index For example, the following shows Oracle will use an index for an X IS NULL predicate if there is an index with X on the leading edge and at least one other column in the index is NOT NULL: ops$tkyte@ORA11GR2> create table t ( x int, y int NOT NULL ); Table created ops$tkyte@ORA11GR2> create unique index t_idx on t(x,y); Index created..

8 statement_types => 'select'); 9* END; SQL> / The DBMS_RLS.ADD_POLICY procedure in the preceding statements creates a policy called manager_policy in the hr schema. This security policy is actually implemented by the function empnum_sec, which is part of the hr_security package that you created earlier. The security policy specifies that it applies to all SELECT operations against the employees table. To put it simply, the new security policy you created (manager_policy) will limit all SELECT statements against the hr.employees table to information that pertains to the employee_id of the user who issued the query. You can check that the new policy was indeed created successfully by making the following query: SQL> SELECT object_name, policy_name, sel, ins, upd, del, enable FROM all_policies; OBJECT_NAME ----------EMPLOYEES SQL> The output of the query indicates that all SELECT statements against the employees table are now controlled by the manager_policy security policy. To make the security policy functions accessible to the public so that all users accessing the database will use it, you can make the following grant: SQL> GRANT EXECUTE ON hr_security TO public; Grant succeeded. POLICY_NAME ------------MANAGER_POLICY SEL ---YES INS --NO UPD ---NO DEL ---NO ENABLED -------YES

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