Is the indicator parallel use / * + PARALLEL * / good or bad?

Hello

I am facing problem in the use of / * + PARALLEL * / hint in SQL Query took his time to run.

Parallel Hint degrades performance?

The FCT_TABLE Table is to have clause PARALLEL (DEGREE by DEFAULT DEFAULT INSTANCES).

We use the suspicion parallel as SELECT / * + PARALLEL (FCT_TABLE 2)

Any help will be necessary for me.

Thanks and greetings

Re: Using parallel Hint / * + PARALLEL * / good or bad?

Bad news. (in production systems)

Why? You, when you code this SQL statement with this point in development, have absolutely no idea of what the production will be like in a month. No idea what data will be. What another charging process will run. Or what will be the version of Oracle and hardware will look like.

Yet, by coding this suspicion in the production of SQL, you claim you know. And not only that, you claim that you are in a position higher than the CBO to make an informed decision on whether to run SQL in parallel. You declare that production DBA knows his work and how to improve performance, and you have decided for them that the SQL should be run in parallel.

Be very careful with advice in the code that lands in the production. Generally these efforts will simply cause more problems to solve problems.

So why the parallel indicator then exist if it is so "+ bad +"?

Very rarely (if ever) there are absolutes in software engineering. And there are exceptions where this indication can be extremely useful. But it's like a hammer in a Toolbox. You use it on the odd nail. You don't use every day to drive screws because the screwdriver is "+ hard +" to use.

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