So I'm running the 4.4.2 -> 4.4.3 upgrade right now, I'm seeing a lot of SELECT * FROM cscart_order_data LIMIT 576400, 400 when I show processlist in mysql. The mysql process has been running for about 50 minutes? By the count of the table I'm guessing this will take about an hour.
This is in a virtualbox so I guess that could account for some slowness, but I'm interested to know what is going on and where this is coming from.