RE: sreadtim and mreadtim < 1ms
Date: Tue, 3 Nov 2009 15:35:13 -0700
Hey Rich, please see responses below.
> you're sure that the low values are due to OS caching?
It's mostly OS caching, but some SAN caching also - either way Oracle's 'physical reads' are very rarely true physical reads so they are almost always occurring in < 1ms
> I tried to see what a 10053 trace says for me, but that info doesn't appear to be available in the trace on 10.1
It was added in 10.2.0.1 according to Jonathan Lewis' Cost-Based Oracle Fundamentals (p.18)
> It could always be a reporting problem in the trace
True, I'm doing more testing to see if the values are actually being used or not.
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