> Is this correct ? Yes, at least under optimal conditions and assuming a reasonably sized row. Things like read-ahead (at the kernel level) will play into it; and if your read (even if assumed to be small) straddles two pages you might or might not take another read depending on your kernel settings (typically trading pollution of page cache vs. number of I/O:s).
-- / Peter Schuller (@scode, http://worldmodscode.wordpress.com)
