How much will be / * + PARALLEL * / use?

Hello

I've always used / * + PARALLEL (tablename, degree) * / but I recently saw a query using just / * + PARALLEL * /.

How much will be / * + PARALLEL * /. use? the degree with which the table is created? If Yes, what happens if the table is created without any parallelism.

I tried to search the Internet but no conclusive answer, so approaching again the expert forum is not found.

I've always used / * + PARALLEL (tablename, degree) * / but I recently saw a query using just / * + PARALLEL * /.

How much will be / * + PARALLEL * /. use? the degree with which the table is created? If Yes, what happens if the table is created without any parallelism.

I tried to search the Internet but no conclusive answer, so approaching again the expert forum is not found.

Interesting - I searched using "parallel index of oracle 11 g" and this was the FIRST link

http://docs.Oracle.com/CD/E11882_01/server.112/e25523/parallel002.htm

Then I searched the page for "parallel" and find section 19.1.2.7 tips for parallel execution which was State

You can specify the parallelism at the level of the object or statement. If you do not explicitly specify an object in the indicator, then parallelism occurs at the level of instruction.

Then, this article explains the difference between the EDUCATIONAL level and OBJECT level parallelism and includes a code example.

And article 3 of the code example shows this:

3 run the following SELECT statement:

SELECT / * + PARALLEL (4) * / hr_emp.last_name, d.department_name
Hr_emp, departments d employees
WHERE the hr_emp.department_id = d.department_id;
Because there is no schema object specified in the PARALLEL indication, the scope of the indicator is education, not an object. This statement requires the request of employees and departments to run with a degree of parallelism to 4, tables substituting defined on tables parallelism setting.

All this took less than 5 minutes and EXACTLY answer your question!

The documentation is your friend.

I suggest that a break of Oracle and research of tutorials on the internet about how to search the Internet. Until you learn how to search effectively on the internet, you will continue to have problems, find answers.

Tags: Database

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