Deleting millions of rows in MySQL

Question

I recently found and fixed a bug in a site I was working on that resulted in millions of duplicate rows of data in a table that will be quite large even without them (still

Answer 1

DELETE FROM `table`
WHERE (whatever criteria)
ORDER BY `id`
LIMIT 1000

Wash, rinse, repeat until zero rows affected. Maybe in a script that sleeps for a second or three between iterations.