Posted by Aurimas Mikalauskas

Few months ago, I wrote about a faster way to do certain table modifications online. It works well when all you want is to remove auto_increment or change ENUM values. When it comes to changes that really require table to be rebuilt - adding/dropping columns or indexes, changing data type, converting data to different character set - MySQL master-master replication especially accompanied by MMM can be very handy to do the changes with virtually no downtime.
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