On Thu, Sep 01, 2005 at 10:13:59PM +0100, Matthew Sackman wrote:
> Well that's the thing - on the queries where it decides to use the index
> it only reads at around 3MB/s and the CPU is maxed out, whereas when it
> doesn't use the index, the disk is being read at 60MB/s. So when it
> decides to use an index, I don't seem to be IO bound at all. Or at least
> that's the way it seems to me.
You are I/O bound; your disk is doing lots and lots of seeks. The SATA
interface is not the bottleneck; the disk's ability to rotate and move its
heads is.
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