thanks for the replies... actually i write this file using perl using module Tie::File ! which runs fast but writing last column takes longer time! so just placed another column name it ran fast, now i have a prob of removing column name so i just posted. i have no clue why it writes so slow i shuffled coulmns but everytime the last column written in file is v slow. i tried it for 1 million records !

i use the following code to fetch the column names, i need to delete that last column (dummy) to be deleted while writing it in file

That sounds like a very strange problem worth its own thread. But since it might not be so easy to debug, please make sure to regard How do I post a question effectively?