Hint ordered and produced Cartesian

I have a question that needs to be tuned.

The initial request does not cross in plan product, when I change the order of the tables in the from clause (I placed the # fewer lines first and the more lines tables in the last) and I get product CARTESIAN MERGE JOIN where clause remaining the same, and the cost increases 7180 to 454 m.

This happens with ordered hint.

ranjus wrote:
I have a question that needs to be tuned.

The initial request does not cross in plan product, when I change the order of the tables in the from clause (I placed the # fewer lines first and the more lines tables in the last) and I get product CARTESIAN MERGE JOIN where clause remaining the same, and the cost increases 7180 to 454 m.

This happens with ordered hint.

Let's take a look at this with a simple test case. Suppose that:
* Table T1 contains 10,000 rows
* Table T2 contains 100 lines
* Table T3 contains 100,000 rows
* Table T4 contains 10 lines

You have the following query:

SELECT
  T1.C1,
  T2.C2,
  T3.C3,
  T4.C4
FROM
  T1,
  T2,
  T3,
  T4
WHERE
  T1.C1=T2.C2
  AND T2.C2=T3.C2
  AND T3.C3=T4.C3;

In the above, you can see that in the WHERE clause:
* Table T1 is attached to table T2
* The T2 table is attached to the tables T1 and T3
* Table T3 is attached to the T2 and T4 tables
* Table T4 joined table T3

It seems you are trying to do, it's something like this based on the number of rows in the tables:

SELECT /*+ ORDERED */
  T1.C1,
  T2.C2,
  T3.C3,
  T4.C4
FROM
  T4,
  T2,
  T1,
  T3
WHERE
  T1.C1=T2.C2
  AND T2.C2=T3.C2
  AND T3.C3=T4.C3;

In the light of the foregoing, we force optimizer Oracle to join the tables T4 and T2 - but there is no direct relationship between the two tables described in the WHERE clause. In one such case, Oracle optimizer must perform a Cartesian join between T4 and T2 tables. Then the T1 table has a relationship defined in the WHERE clause with the table T2, so that the join would not result in a Cartesian product. Finally, the T3 array has a relationship between tables T2 and T4, so that would not result in a Cartesian product.

Back to this example, suppose table T4 contained a single line. The execution plan still shows a Cartesian join, but this Cartesian join is no worse than a join of nested loops because there is only one line in one of the sources of the line.

In short, think what you try to force the optimizer to do. You cannot join always ascending rank cardinality estimates - it simply is not logic to try in some cases.

Charles Hooper
Co-author of "Expert Oracle practices: Oracle Database Administration of the Oak Table.
http://hoopercharles.WordPress.com/
IT Manager/Oracle DBA
K & M-making Machine, Inc.

Tags: Database

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***************************************************
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