Another tool in this category is gh-ost by github: https://github.com/github/gh-ost https://github.com/github/gh-ost Its main advantage seems to be that it doe

Another tool in this category is gh-ost by github: https://github.com/github/gh-ost https://github.com/github/gh-ost Its main advantage seems to be that it doesn't require triggers on the original table (it works by subscribing to the replication log), thus not making write locks worse during the migration. I haven't tried either yet, so if anybody has some experience with them, do please share a comparison!