dynamicField Scaling

[mark angelillo]

Hello,

I've got a Solr index running and I want to use a dynamicField to  
store n different sorting fields. The field that is used to actually  
sort the results will be determined by the application that is  
querying the index.

I'm wondering if anyone has done something similar to this, or if  
anyone has an idea of how Solr will perform as the number n of  
sorting fields grows larger. Is there a way to make sure this doesn't  
start to slow the index down? Is there any information out there  
about the number of dynamicFields that can be declared in this way  
before the entire index suffers? Is there such a limit?

(I'm assuming the number of documents in the index will eventually be  
around 500k -- perhaps more in the future.)

TIA,
Mark Angelillo