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The procedure do_rel_update updates one column of all rows in the table components_rel: 126 127 128 129 130 131 procedure do_rel_update as begin update components_rel set component_name = component_name || ' or update'; end do_rel_update;

Beyond the mandatory username/password requirement for using the SQL*Plus interface, Oracle provides an additional security mechanism that involves the use of a special table called product_ user_profile. This table is owned by the System user, one of the two super users of the Oracle database. By using the product_user_profile table, you can limit access to SQL*Plus and SQL commands, and to PL/SQL statements as well. When a user logs into the SQL*Plus session, SQL*Plus checks this table to see what restrictions are supposed to be applied to the user in the SQL*Plus session. How Oracle administers this security layer is a little bit tricky. The user may have an insert or a delete privilege in the database, but because the SQL*Plus privileges override this privilege, Oracle may deny the user the right to exercise the privilege. After you create a database, you should execute a special script, pupbld.sql, which is used to support SQL*Plus security. This script is located in the $ORACLE_HOME/sql/admin directory, and it should be run as the System user. This script will build the product_user_profile table, which is actually a synonym for the sqlplus_product_user_profile table. Listing 4-1 shows the format of this table. Listing 4-1. The product_user_profile Table SQL> DESC product_user_profile Name Null Type ------------------------------ -------- ---------------------PRODUCT NOT NULL VARCHAR2(30) USERID VARCHAR2(30) ATTRIBUTE VARCHAR2(240) SCOPE VARCHAR2(240) NUMERIC_VALUE NUMBER(15,2) CHAR_VALUE VARCHAR2(240) DATE_VALUE DATE LONG_VALUE LONG SQL>

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Note By default, SQL*Plus imposes no usage restrictions on any users, so when the product_user_profile table is first created, there are no rows in it. The System user has to explicitly insert rows into the product_user_profile table if some users need to be restricted in SQL*Plus. You can choose to restrict a user from executing the following commands: ALTER, BEGIN, CONNECT, DECLARE, EXEC, EXECUTE, GRANT, HOST, INSERT, SELECT, and UPDATE. If you get errors stating INVALID COMMAND when a user issues one of these statements, even though your product_user_profile table is empty, run the pupbld.sql script as the System user.

Listing 4-2 shows how you can use the product_user_profile table to prevent the user OE from deleting, inserting, or updating any data in the database. Listing 4-2. Using the product_user_profile Table SQL> INSERT INTO product_user_profile VALUES ('SQL*PLUS','OE','INSERT',NULL,NULL,NULL,NULL,NULL); 1 row created. SQL> INSERT INTO product_user_profile VALUES ('SQL*PLUS','OE','DELETE',NULL,NULL,NULL,NULL,NULL); 1 row created. SQL> INSERT INTO product_user_profile VALUES ('SQL*PLUS','OE','UPDATE',NULL,NULL,NULL,NULL,NULL); 1 row created. SQL> COMMIT; Commit complete. SQL> You can see the entries pertaining to user OE by querying the product_user_profile table as follows: SQL> SELECT product, attribute FROM product_user_profile WHERE userid='OE'; PRODUCT ATTRIBUTE ------------------------------------SQL*PLUS INSERT SQL*PLUS DELETE SQL*PLUS UPDATE SQL> If the user OE tries to delete data from a table, the result would be the following error, even though the orders table belongs to the OE schema: SQL> CONNECT oe/oe Connected. SQL> DELETE FROM oe.orders; SP2-0544: invalid command: delete SQL> If you want to grant to user OE the right to delete data through SQL*Plus, you can do so by deleting the relevant line from the product_user_profile table, as follows:

The procedure do_rel_child_update updates one column of all rows in the child table parts_rel: 133 134 135 136 137 138 139 140 141 142 procedure do_rel_child_update as begin for i in 1..g_num_of_child_updates loop update parts_rel set part_desc = part_desc || ' updated' where part_id = i; end loop; end do_rel_child_update; The procedure do_nt_update updates one column of all rows in the table components_nt: 144 145 146 147 148 149 procedure do_nt_update as begin update components_nt set component_name = component_name || ' or update'; end do_nt_update;

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