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Answer by Jonathan Fite for alter table alter column causes huge log and data...
minimum storage for a VARCHAR is 4 bytes, I think, so you did change the size of the column from 1 byte to at least 4 bytes, causing (as you have observed) large amounts of data movement as the column...
View Articlealter table alter column causes huge log and data file growth
I have a table with 2.6B rows in it and I need to change a column from Char(1) to Varchar(64). the table is over 300GB with a few indexes. The column in nullable, so the transaction i'm running...
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