What broadcast and Round Robin at the same time of the modes of distribution?

Hi all

as you know it some methods so that they were distributing data between consumer and producer of games. for ex: partition, hash, range...

If you use one order by statement at the same time a statement that you will probably see the range method because the sets of consumption creates a range of order the lines and every time an execution in parallel to producer (parallel) server wants to send a row, he look for parallel processes of consumer who has an appropriate range of selection.

but on the methods of dissemination and Round robin, I couldn't understand what they do and how to work Hey... I searched the documentation, but I couldn't find a document that explains their good. for ex if I write a select statement like this
select /*+ parallel(sales, 4) */ * from sh.sales
union
select * from sh.sales2
then I can see alternating in the execution plan.

So what's "Broadcast" and what do do "Round robin".

Thanks a lot for the answers.

Edited by: elcaro on Sep 25, 2011 11:00

in the method of Robin, a set of parallel processes to manage your data and process series send all data (she) up to the parallel treats each as a game of poker. in your example, manages the sales data in the table by the (process) parallel execution servers and sales2 table is managed by a process series (one).

disseminate the method, a line sends to all the processes of consumption.

Tags: Database

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