Plan of the hash value for two queries!
HelloDB: Oracle 11g (11.2.0.3.0)
OS: RHEL 5
I have two question:
1. can two queries have the same hash value of the plan? I mean I have here are two queries:
SELECT /+ NO_MERGE * / MIN (payor.next_review_date). *
* Payer from *.
* WHERE payor.review_complete = 0 *.
* AND payor.closing_date IS NULL *.
* AND payor.patient_key = 10; *
and
SELECT MIN (payor.next_review_date)
* Payer from *.
* WHERE payor.review_complete = 0 *.
* AND payor.closing_date IS NULL *.
* AND payor.patient_key = 10; *
When I tried to examine the execution plan for the two motions, the hash value of the plan remains the same. This means that implementation plan for both queries are same? If so, then how Oracle includes or changes to the execution plan based on hint. If not, then what hash value of the plan represents?
2. If the plan with suspicion, and without suspicion is identical except for a given query except the number of lines and bytes. Do you mean this query with fewer lines and scanned bytes is better?
Thanks in advance
-Onkar
>
1. can two queries have the same hash value of the plan?
>
Yes - as already said - but it's not just because of tips.
Here is the example code that I use to show that Oracle does NOT simply use a text version of the query that you propose and compute a hash of it.
These two queries are radically different but have the same hash value; Oracle are not different at all.
set serveroutput on
set autotrace traceonly
select * from DEPT A, EMP B
where A.DEPTNO=B.DEPTNO
SQL> select * from DEPT A, EMP B
2 where A.DEPTNO=B.DEPTNO
3 /
14 rows selected.
Execution Plan
----------------------------------------------------------
Plan hash value: 844388907
select * from
(select * from DEPT) A, (select * from EMP) B
WHERE A.DEPTNO = B.DEPTNO
SQL> select * from
2 (select * from DEPT) A, (select * from EMP) B
3 WHERE A.DEPTNO = B.DEPTNO
4 /
14 rows selected.
Execution Plan
----------------------------------------------------------
Plan hash value: 844388907
Tags: Database
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Thanks for the display of the data of the sample; It's very useful!
I think OP wants something like this:
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