Memory usage of lookup_ext function

Hi Experts,

     I have a query transformation in my BODS job. The Query transform has got 10 look up functions looking into the same table which are all configured as Pre-Cache. I want to know whether all these look up functions keep a copy of the look up table(so that the memory is 10 x lookup table) or single copy for a data flow.

Thanks & Regards

Alex Oommen