Memory usage

[Karl-Heinz Zengerle]

Hi world.
 
I'm developing a report pushing possibly much data from a database into
an Excel file.
 
Because of this I read just portions from the database into memory and
push them to the proper POI objects. So at his side I need just a
limited amount of memory.
 
Does POI keep all information in memory? Or does it load just parts
which are explicitly queried, modified or inserted?
 
MfG 
Karl-Heinz Zengerle