>-----Original Message----- <snip> >What I was really trying to figure out was why it takes me 4 hours to >add a new column to my 22-million-row table, and whether a different >table design can avoid that problem. That reply in the forum says, >"ALTER TABLE ... ADD COLUMN will always copy the entire table over, >and rebuild all the indexes. (And, effectively, do an OPTIMIZE.) Do >_not_ leave space for extra columns, it won't help." I'm about to >reply and point out the trick that you suggested to me: create dummy >columns early and then just rename them later :) > > -Bennett > [JS] They will be too small, or the wrong type, or there won't be enough of them. Based upon 30+ years of database design, I'd bet money on it. ;-)
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