alter session set query_rewrite_integrity=enforced : Session variable « SQL Plus « Oracle PL / SQL

1. Oracle PL / SQL
2. SQL Plus
3. Session variable

alter session set query_rewrite_integrity=enforced

    
SQL> CREATE TABLE EMP(
  2      EMPNO NUMBER(4) NOT NULL,
  3      ENAME VARCHAR2(10),
  4      JOB VARCHAR2(9),
  5      MGR NUMBER(4),
  6      HIREDATE DATE,
  7      SAL NUMBER(7, 2),
  8      COMM NUMBER(7, 2),
  9      DEPTNO NUMBER(2)
 10  );
SQL>
SQL> INSERT INTO EMP VALUES(7369, 'SMITH', 'CLERK', 7902,TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);
SQL> INSERT INTO EMP VALUES(7499, 'ALLEN', 'SALESMAN', 7698,TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);
SQL> INSERT INTO EMP VALUES(7521, 'WARD', 'SALESMAN', 7698,TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);
SQL> INSERT INTO EMP VALUES(7566, 'JONES', 'MANAGER', 7839,TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);
SQL> INSERT INTO EMP VALUES(7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);
SQL> INSERT INTO EMP VALUES(7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);
SQL> INSERT INTO EMP VALUES(7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);
SQL> INSERT INTO EMP VALUES(7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);
SQL> INSERT INTO EMP VALUES(7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);
SQL> INSERT INTO EMP VALUES(7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);
SQL> INSERT INTO EMP VALUES(7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);
SQL> INSERT INTO EMP VALUES(7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);
SQL> INSERT INTO EMP VALUES(7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);
SQL> INSERT INTO EMP VALUES(7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);
SQL>
SQL> CREATE TABLE DEPT(
  2      DEPTNO NUMBER(2),
  3      DNAME VARCHAR2(14),
  4      LOC VARCHAR2(13)
  5  );
SQL>
SQL> INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');
SQL> INSERT INTO DEPT VALUES (20, 'RESEARCH', 'DALLAS');
SQL> INSERT INTO DEPT VALUES (30, 'SALES', 'CHICAGO');
SQL> INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');
SQL>
SQL>
SQL>
SQL> alter session set query_rewrite_enabled=true;
SQL>
SQL> alter session set query_rewrite_integrity=enforced;
SQL>
SQL> set autotrace traceonly explain
SQL>
SQL> select dept.deptno, dept.dname, count (*)
  2    from emp, dept
  3   where emp.deptno = dept.deptno
  4   group by dept.deptno, dept.dname
  5  /

Execution Plan
----------------------------------------------------------
Plan hash value: 3219813164

------------------------------------------------------------
| Id  | Operation           | Name | Rows  | Bytes | Cost  |
------------------------------------------------------------
|   0 | SELECT STATEMENT    |      |    67 |  4690 |     5 |
|   1 |  SORT GROUP BY      |      |    67 |  4690 |     5 |
|*  2 |   HASH JOIN         |      |    67 |  4690 |     3 |
|   3 |    TABLE ACCESS FULL| EMP  |    82 |  1066 |     1 |
|   4 |    TABLE ACCESS FULL| DEPT |    82 |  4674 |     1 |
------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("EMP"."DEPTNO"="DEPT"."DEPTNO")

Note
-----
   - cpu costing is off (consider enabling it)

SQL>
SQL>
SQL> select count(*) from emp;

Execution Plan
----------------------------------------------------------
Plan hash value: 2083865914

---------------------------------------------------
| Id  | Operation          | Name | Rows  | Cost  |
---------------------------------------------------
|   0 | SELECT STATEMENT   |      |     1 |     1 |
|   1 |  SORT AGGREGATE    |      |     1 |       |
|   2 |   TABLE ACCESS FULL| EMP  |    82 |     1 |
---------------------------------------------------

Note
-----
   - cpu costing is off (consider enabling it)

SQL>
SQL> select * from dept where initcap(dname) = 'Sales';

Execution Plan
----------------------------------------------------------
Plan hash value: 3383998547

----------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost  |
----------------------------------------------------------
|   0 | SELECT STATEMENT  |      |     1 |    39 |     1 |
|*  1 |  TABLE ACCESS FULL| DEPT |     1 |    39 |     1 |
----------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(INITCAP("DNAME")='Sales')

Note
-----
   - cpu costing is off (consider enabling it)

SQL>
SQL>
SQL> set autotrace off
SQL>
SQL>
SQL> drop table emp;
SQL>
SQL> drop table dept;

   
    
    
    
  

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