Thank you Rama,
Thanks for your reply, but i think there is some gap between our understanding.
i will explain the scenario in brief,
Suppose person A is uploading some files form his machine,
person B is uploading some files form his machine,
and person C is doing the same thing from his machine,
and there is one person D who will download all the files of A B and C from his machine which are saved in Z table in RAWSTRING format.
I guess in your document the there is a same person who is uploading and downloading these files.
also I guess Mr. Rohith Brungi was having the same requirement who has commented in your document.
Thanks for help