>> Why would delay_key_writes require a table rebuild? It's not >> modifying the data. Reloading tens of millions of rows for several >> hours seems to be a waste of time.
It probably flips a bit in the .frm file or something like that, but I have not investigated it myself. My guess is that you can "hack" this to do what you want. We wrote about this in our book -- you can alter ENUM lists without a table rebuild, for example. I'm betting you can do the same thing here. Rather than describe the whole thing let me show you the blog post Aurimas wrote about it: http://www.mysqlperformanceblog.com/2007/10/29/hacking-to-make-alter-table-online-for-certain-changes/ Baron -- Baron Schwartz, Director of Consulting, Percona Inc. Our Blog: http://www.mysqlperformanceblog.com/ Our Services: http://www.percona.com/services.html -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
