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First, we will create the hr_security package, which we will use later to access the application context. This package is the key to row-level security, since it generates the dynamic-access predicates for a table. Listing 12-13 shows how to create the hr_security package. Listing 12-13. Creating the hr_security Package SQL> CREATE OR REPLACE PACKAGE hr_security AS 2 FUNCTION empnum_sec (A1 VARCHAR2, A2 VARCHAR2) 3 RETURN varchar2; 4 END; 5*/ Package created. SQL> CREATE OR REPLACE PACKAGE BODY hr_security AS 2 FUNCTION empnum_sec (A1 VARCHAR2, A2 VARCHAR2) 3 RETURN varchar2 4 IS 5 d_predicate varchar2 (2000); 6 BEGIN 7 d_predicate:= 'employee_id = 8 SYS_CONTEXT("EMPLOYEE_INFO","EMP_NUM")'; 9 RETURN d_predicate; 10 END empnum_sec; 11 END hr_security; 12* / Package body created. SQL> The package created in Listing 12-13, hr_security, will use the employee_info context (created earlier in the Creating the Application Context section) to get the emp_num variable. As you recall from the previous section, the employee_info application context gets the emp_num variable from the USERENV namespace (the SESSION_USER attribute of the USERENV namespace). The d_predicate predicate in the hr_security package indicates the transformation that should be applied to any queries made by any employee whose employee_id matches the emp_num variable obtained from the employee_info context. For example, if user salapati issues the following command: SQL> SELECT * FROM employees; it will be modified by our predicate (d_predicate) as follows: SQL> SELECT * FROM employees 2* WHERE employee_id = SYS_CONTEXT ('EMPLOYEE_INFO', 'EMP_NUM');

BTREE_SPACE PCT ----------- -----2702744 89.0

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B*Tree indexes, except in the special case of cluster B*Tree indexes, do not store completely Null entries, but bitmap and cluster indexes do. This side effect can be a point of confusion, but it can actually be used to your advantage when you understand what not storing entirely null keys implies. To see the effect of the fact that Null values are not stored, consider this example: ops$tkyte@ORA11GR2> create table t ( x int, y int ); Table created. ops$tkyte@ORA11GR2> create unique index t_idx on t(x,y); Index created. ops$tkyte@ORA11GR2> insert into t values ( 1, 1 ); 1 row created. ops$tkyte@ORA11GR2> insert into t values ( 1, NULL ); 1 row created. ops$tkyte@ORA11GR2> insert into t values ( NULL, 1 ); 1 row created. ops$tkyte@ORA11GR2> insert into t values ( NULL, NULL ); 1 row created. ops$tkyte@ORA11GR2> analyze index t_idx validate structure; Index analyzed. ops$tkyte@ORA11GR2> select name, lf_rows from index_stats; NAME LF_ROWS ------------------------------ ---------T_IDX 3

The hr_security package created in the previous section lets you attach a dynamic predicate (WHERE employee_id = SYS_CONTEXT ('EMPLOYEE_INFO', 'EMP_NUM')) to any SQL statements that can be used by employees whose employee_id matches the emp_num derived by using the employee_info application context. But we still haven t attached a security policy to the employees table. That is, we now have to specify what kinds of SQL statements, and precisely what tables, the hr_security package would be applied to. In previous releases of the Oracle database, all security polices were dynamic, meaning the database had to execute the policy function for each DML statement. Of course, repeated execution of the policy functions costs system resources and could hurt performance in a busy OLTP database. Oracle now offers several choices regarding the type of policy you can use. You can specify the

following five types of security policies by using the POLICY_TYPE parameter of the DBMS_RLSADD_ POLICY procedure: Dynamic: Each time a statement is parsed or executed, the security policy function is executed afresh This is the default policy type, and you can specify it either by setting the POLICY_TYPE parameter to DBMS_RLSDYNAMIC or by just leaving the parameter out altogether Static: This type of policy function needs to be executed only once, when a user first accesses a database object Thereafter, the value of the policy function is cached in the SGA, and all users accessing the object will get the same predicate You can choose this type by setting the POLICY_TYPE parameter to DBMS_RLSSTATIC.

OPT_CMPR_COUNT OPT_CMPR_PCTSAVE -------------- ---------------2 28

The table has four rows, whereas the index only has three The first three rows, where at least one of the index key elements was not Null, are in the index The last row with (NULL, NULL) is not in the index One of the areas of confusion is when the index is a unique index, as just shown Consider the effect of the following three INSERT statements: ops$tkyte@ORA11GR2> insert into t values ( NULL, NULL ); 1 row created ops$tkyte@ORA11GR2> insert into t values ( NULL, 1 ); insert into t values ( NULL, 1 ) * ERROR at line 1: ORA-00001: unique constraint (OPS$TKYTET_IDX) violated ops$tkyte@ORA11GR2> insert into t values ( 1, NULL ); insert into t values ( 1, NULL ) * ERROR at line 1: ORA-00001: unique constraint (OPS$TKYTE.

The function must be deterministic so that the predicate returned is always the same: if you have a branch in the function that can return different predicates, you must specify a dynamic security policy instead Shared static: This is identical to a static policy, and it is applied to multiple objects Shared policies reduce your administrative burden by letting a single security policy cover several database objects You can enable it by setting the POLICY_TYPE parameter to DBMS_RLSSHARED_STATIC Context sensitive: Under this type of security policy, the policy predicate can be modified based on changes in certain context attributes within a user s session The database caches the policy predicate in the SGA You choose this type by setting the POLICY_TYPE parameter to DBMS_RLSCONTEXT_SENSITIVE Shared context sensitive: This policy type is similar to context-sensitive policies, but it is shared across multiple objects.

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