Forgive me if I don't see the problem here, but this sounds like a database join, not something you want to be loading into perl one row at a time. More like you want to do the join (is it SQL?) in the DB and capture the results if any. Approx: 
  SELECT * from lines, coords
  WHERE  x_pos >= start_x 
     AND x_pos <= end_x

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In reply to Re: fast way of working with numerical positions by Anonymous Monk
in thread fast way of working with numerical positions by Anonymous Monk

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