G'day uajith,

Welcome to the monastery.

Replies already posted regarding what your concept of "big" is are valid.

I'll just point out that Perl provides a way to read files in paragraph mode, as follows:

{
    local $/ = "";

    while (<$file_handle>) {
        # $_ contains a paragraph of text read from $file_handle
        # Process each paragraph here
    }
}
[download]

Search for $INPUT_RECORD_SEPARATOR in perlvar for details.