On Tue, Mar 9, 2010 at 2:28 PM, Sylvain Lebresne <sylv...@yakaz.com> wrote:
> > A row causes a disk seek while columns are contiguous. So if the row > isn't > > in the cache, you're being impaired by the seeks. In general, fatter > rows > > should be more performant than skinny ones. > > Sure, I understand that. Still, I get 400 columns by seconds (ie, 400 seeks > by > seconds) when the rows only have one column by row, while I have 10 columns > by seconds when the row have 100 columns, even though I read only the first > column. > Doesn't that imply the disk is having to seek further for the rows with more columns? -Brandon
