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Fastest Mass Update

I am attempted to find the quickest way to perform an update of 4-6 million rows in a sql table. Our customers do not have enough disk space to do this update in 1 batch. I have attempted the following while loop while commiting every 100000 updates, but the update still takes hours to perform. Anyone have ideas on how to make this work faster? Any ideas would be greatly appreciated.

declare @oid varchar(13)
declare @count int
set @count = 0
set @optimizeSize = 100000
select @oid = min(foo.object_id) from foo where x = 1
while @oid is not null
update foo wehre foo.object_id = @oid
select @oid = min(foo.object_id) from foo where x = 1 and foo.object_id > @oid
set @count = @count + 1
IF @count = @optimizeSize
commit transaction
set @count = 0

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