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From Peter Schuller <>
Subject Re: Read IO
Date Thu, 21 Feb 2013 06:04:35 GMT
> 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,

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