What does the row source generator does ?

Hi,
I am looking for a small sort of defination of row source generator. actually i have gone through the defintaion,and bit confused.please follow your defination with an example which could give me better see .i am confused in these line
"it outputs the execution plan for the sql statements" and " the row source generator is collection of row sources structred in the form of tree".
thanks
Alok.

The source of these words is a the Oracle documentation.
The row source generator is a translator: it converts the optimal execution plan into a concrete set of instructions for the SQL engine. That, at least, is my understanding.
Perhaps it might help to think of it as an exercise in navigation. The optimal plan for getting from A to B is to go via D and F. But what you tell the driver is, "go 2 miles down A-road, take third turning on left, go straight ahead at the D crossroads, take the first road on the right, then it's the third exit off the F roundabout and B is the lefthand road at the next t-junction". Of course, the problem witrh analogies is that they can confuse the issue rather than illuminate it.
So my advice is, don't sweat the details. Approach the optimizer as a black box and get a feel for what it does by playing with queries. Then re-read the architectural definition and see if it makes more sense.
Cheers, APC

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