> Test 1
> Amount of data - 5.5 million rows. Time Taken - 6+hrs Approximately.
>  
> Test2
> Amount of data - 0.45 million rows. Time Taken - 2 mins approximately.

Is this an InnoDB database by any chance?  If it is, and it is a clean
import, then disable the FOREIGN_KEY_CHECKS.  

  SET AUTOCOMMIT = 0;
  SET FOREIGN_KEY_CHECKS=0;

This is a small tip i picked up on the MySQL documentation that someone
had left in the comments and has been to date one of those tips that has
literally saved DAYS of my life.

a

ps Remember to put them back on again after you finish the import

  SET AUTOCOMMIT = 1;
  SET FOREIGN_KEY_CHECKS=1;

-- 
 Alan Williamson, Technology Evangelist
 SpikeSource Inc.
 Daily OS News @ http://compiledby.spikesource.com/

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