What is the meaning of the optimizer based on CSSTidy referring "A ORDERED USE_NL" Please?

Hi all

What is the meaning of the optimizer based on CSSTidy referring "A ORDERED USE_NL" Please?

I searched the internet without great success (indicators of optimizer). Can you please enlighten me on this? Thank you.

My problem is that it works well on a database and another data base, it is really slow.

Kind regards

Michael.

Councils ORDERED to join the table in the order that they are put in the FROM clause. USE_NL oracle tips to use sweeping LOOP IMBRIQUEE.

Here is an example. Find the order in which the tables are specified in the clause and the output of the execution plan.

SQL> select /*+ ORDERED USE_NL(e d) */ d.dname, e.ename from emp e join dept d on e.deptno = d.deptno;
...
----------------------------------------------------------------------------------------
| Id  | Operation                    | Name    | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT             |         |       |       |     5 (100)|          |
|   1 |  NESTED LOOPS                |         |    11 |   242 |     5   (0)| 00:00:01 |
|   2 |   TABLE ACCESS FULL          | EMP     |    11 |    99 |     2   (0)| 00:00:01 |
|   3 |   TABLE ACCESS BY INDEX ROWID| DEPT    |     1 |    13 |     1   (0)| 00:00:01 |
|*  4 |    INDEX UNIQUE SCAN         | DEPT_PK |     1 |       |     1   (0)| 00:00:01 |
----------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
   4 - access("E"."DEPTNO"="D"."DEPTNO")

SQL> select /*+ ORDERED USE_NL(e d) */ d.dname, e.ename from dept d join emp e on e.deptno = d.deptno;
...
---------------------------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |      |       |       |     5 (100)|          |
|   1 |  NESTED LOOPS      |      |    11 |   242 |     5   (0)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| DEPT |     4 |    52 |     2   (0)| 00:00:01 |
|*  3 |   TABLE ACCESS FULL| EMP  |     3 |    27 |     1   (0)| 00:00:01 |
---------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
   3 - filter("E"."DEPTNO"="D"."DEPTNO")

Tags: Database

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