optimizer documentation

[Rick Hillegas]

I'm puzzled by the following paragraph in Tuning Guide->DML statements 
and performance->Performance and optimization->Joins and 
performance->Join strategies:

"If memory use is not a problem for your environment, set this property 
to a high number; allowing the optimizer the maximum flexibility in 
considering a join strategy queries involving large queries leads to 
better performance. It can also be set to smaller values for more 
limited environments."

I can't find the name of this property on that page of the Tuning Guide. 
I'm also confused about what we consider to be a "high number" versus 
what we consider to be "smaller values". Would appreciate advice here.

Thanks,
-Rick