Not the same State (<>) of nested loops

Hi gurus and Experts.

I need advice/suggestion on the query plan below. This plan is go for Nested Loops, am not able to force to go to the hash join or Merge Join with tips.
Can someone help me please what is happening, and it is possible to escape from nested loops.
I don't want to take the help of index for this scenario.

D/B: Oracle 11 g 2,

create table parent as
with main as (select --+materialize 
round(dbms_random.value(low=>1,high=>100)) SAMPLE_ID,dbms_random.string(opt=>'U',len=>10) SAMPLE_TEXT,rownum id from dual
connect by level<=100000)
select sample_id,rpad(sample_text,10,'*') padding,sample_text,id from main order by id

create table child as
with main as (select --+materialize 
round(dbms_random.value(low=>1,high=>100)) SAMPLE_ID,dbms_random.string(opt=>'U',len=>10) SAMPLE_TEXT,rownum id from dual
connect by level<=10000)
select sample_id,rpad(sample_text,10,'*') padding,sample_text,id from main order by id

select --+use_hash(p c)
p.id from parent p,child c where p.id<>c.id

Plan
SELECT STATEMENT  ALL_ROWSCost: 973,076  Bytes: 8,999,910,000  Cardinality: 999,990,000            
     3 NESTED LOOPS  Cost: 973,076  Bytes: 8,999,910,000  Cardinality: 999,990,000       
          1 TABLE ACCESS FULL TABLE APP.CHILD Cost: 12  Bytes: 40,000  Cardinality: 10,000  
          2 TABLE ACCESS FULL TABLE APP.PARENT Cost: 97  Bytes: 499,995  Cardinality: 99,999

902629 wrote:

I need advice/suggestion on the query plan below. This plan is go for Nested Loops, am not able to force to go to the hash join or Merge Join with tips.

You will not be able to use a hash join

http://docs.Oracle.com/CD/E11882_01/server.112/e16638/optimops.htm#i36043

>
The optimizer uses hash join to join two tables if they are added by using an equijoin and if one of the following conditions are met:
>

You may be able to force a sort merge join, it does not mention if different will work, I don't see how it would be

http://docs.Oracle.com/CD/E11882_01/server.112/e16638/optimops.htm#i49183

>
Sort merge joins are useful when the join condition between two tables is a condition of inequality such as <,> <=,>, or > =. Fusion type joints are more successful than joins loops nested for large sets of data. You cannot use hash joins unless there is a condition of equality.
>

I can't imagine this treatment an antijoin more efficiently than nested If loops.

Tags: Database

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