MySQL Performance Tip: ON DUPLICATE KEY is faster than INSERT IGNORE, but failing with a duplicate key error is a lot faster - Eddie On EverythingI’m working on merging a couple of pretty big MySQL databases. Each database consists of just three tables, but each of those tables has at least 9 million rows. Because I need to maintain and update a number of data associations, it was necessary to write a custom script to perform the merge. (I chose to use Perl and DBI.) At one point in my script, I need to do a bunch of “insert this row from d
