Performance problem on the SQL query that does not use the primary key index

Hello!

I have some performance issues on a single SQL query (Oracle 10 g).
I could solve the problem by using the INDEX indicator, but I would like to know WHY this is happening.

* Tables *.
create table jobs)
ID number (5) not null,
name varchar2 (100),
primary key constraint Job_PK (id)
)
/
-Record count: 298

create table Comp)
integer ID not null,
name varchar2 (100),
primary key constraint Comp_PK (id)
)
/
-Record count: 193

-Relation m: n
create table JobComp)
integer ID not null,
id_job integer not null,
id_comp integer not null,
primary key constraint JobComp_PK (id),
unique key constraint JobComp_UK (id_job, id_comp),
Constraint JobComp_FK_Job foreign key (id_job) refers to Job (id),
Constraint JobComp_FK_Comp foreign key (id_comp) makes reference Comp (id)
)
/
create index JobComp_IX_Comp on JobComp (Cod_Comp)
/
create index JobComp_IX_Job on JobComp (Cod_Job)
/
-Record count: 6431

* Ask *.

When I run this query, the execution plan shows the index using (JobComp_PK and JobComp_IX_Comp).
No problem.

Select JobComp.*
of JobComp
Join jobs
on Job.id = JobComp.id_job
where JobComp.id_comp = 134
/
-runs in 0.20 sec

But when I add the field 'name' of the work table the plan uses full access table to the table of work

Select JobComp.*, Job.name
of JobComp
Join jobs
on Job.id = JobComp.id_job
where JobComp.id_comp = 134
/
-runs in the 2.70 dry

With the help of the index

Select / * + INDEX (Job Job_PK) * /.
JobComp.*, Job.name
of JobComp
Join jobs
on Job.id = JobComp.id_job
where JobComp.id_comp = 134
/
-runs in 0.20 sec

* Doubt *.

This behavior is correct?

PS. : I tried to recalculate the statistics, but nothing changes:

analyze the job calculation table statistics.
/
change the statistical calculation of index Job_PK reconstruction;
/
Start
dbms_utility.analyze_schema (sys_context ('userenv', 'current_schema'), 'CALCULATE');
end;
/

[of]
Gustavo Ehrhardt

Gus.EHR wrote:
Hello.
I'm sorry for the plan unformatted.
The execution time of the querys "without field name' and 'with the field name with suspicion" are equal.
He has no problem caching, because I get the plans of the sequence different from the querys and repeated the performance. The result is always the same.

I don't think that there is no problem with oracle crossing LOOP IMBRIQUEE to the HASH JOIN when you include the field name and this should be the expected behavior. But it seems that your WORKING table has a degree of parallelism set against what is causing the query to run in parallel (as JOB table is now available with full table scan, instead of indexed access earlier). It could be that the parallel execution is contributor to extra Runtime.
(a) do you know why the degree of parallelism on the WORK table has been defined? Do you need it?

You can see if the following query provides a better response time?

select /*+ NOPARALLEL(JOB) */ JobComp.*, Job.Name
  from JobComp
  join Job
    on Job.id = JobComp.id_job
 where JobComp.id_comp = 134

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