I can only speak from my personal experience, but the applications I made stored the unique results of the request in a file (it were spreadsheets, but that is irrelevant for this discussion) and just returned a link to this file to the client requesting it. All the heavy lifting of making the file was done by the Perl script and the sending of the file to the client was done by the Apache server. As far as the webserver was concerned this was just a static file. I found it most efficient. Once every so often a cron job would reap all "old" files to reclaim disk space.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In reply to Re^3: Finding the right PDF module by CountZero
in thread Finding the right PDF module by ksublondie

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