OAMessageFileUploadBean eating memory

I've implemented an upload page using OAMessageFileUploadBean going to a BLOB column in a table. It all works fine except for one thing - when I upload very big files (100s of MB) the memory of the JVM goes up accordingly and eventually runs out.
I'm confused because against the OAMessageFileUploadBean I've set data type = BLOB, set the view instance, and set the view attribute to the name of the BLOB column. The developer guide says that if these are set "the file content would not be cached in the data object", so I don't suppose it's that which is eating memory.
I imagined that when the upload servlet is populating the new VO instance for my table, it would pass the data through the BlobDomain attribute directly into the BLOB column of the table using io streams, without manifesting it in JVM memory. Maybe this is incorrect or maybe the upload servlet itself is reading all uploaded data into memory?
Any help or clarifications gratefully received!
Thanks
S.

Run Activity Monitor and set it to show all processes
To terminate processes, you can hold down Command + Option + Escape
Allan

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