I'm still fiddling with simple database queries using Takusen. One question I have is regarding strictness. I've just been reading "Haskell IO for Imperative Programmers" and loved the idea that laziness (rather than monads) is what makes IO in Haskell so simple. What I'm not sure about, is whether Takusen offers a way of lazily getting data from a database (and a meta-question - how do I work this out for mysefl?!) With the code {-# OPTIONS -fglasgow-exts #-} import Database.Oracle.Enumerator import Database.Enumerator runSql :: String -> IO [String] runSql s = withSession (connect "USER" "PASSWD" "DB") ( do let iter (s::String) accum = result (s : accum) r <- doQuery (sql s) iter [] return r ) main :: IO () main = do r <- runSql "select username from all_users" putStrLn (unlines r) I can do a simple database query, process the results, and produce output. The sreucture of main is much like an interact loop, but with the input from a database rather than stdin. But, will this read the database lazily, or will it get all the rows into memory at once? How will using result' instead of result (in runSql) affect this? And as I said above, how can I learn to work this out for myself? I know I could just ignore the issue until performance becomes a problem and then profile - but that ignores the question of whether I've got the idiom right. Thanks for any help, Paul.