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by einhverfr 5237 days ago
I think the problem is that when you change a table structure in MySQL, it takes quite a bit of time to do the actual writes. Adding a column tends to force a rewrite of the table. Braindead I know....

I think the problem is that MySQL isn't really a standard SQL-world db. It has some of the advantages of one, but not all of them and some very annoying gotchas.