Re: I/O and db_file_multiblock_read_count

Kevin,

This thread had got broken into two distinct problems from the beginning: 1 - performance of scattered read. 2 - system statistics. Sure thing testing will shed some light on the first one. I was just making point on the other.

• Vlad

On 12/10/06, Kevin Closson <kevinc_at_polyserve.com> wrote:
>
> You folks are freaking me out. The OP could easily be handled by testing
> with a scan "agent" that doesn't vary its I/O profile. I said so straight
> out of the
> gate and Mark said so with very rich supporting text. Let's just see what
> the array head
> can deliver to dd(1) since it scans with precisely the same sort of I/O as
> a scattered
> read except (most critical) it is buffered in the data segment of dd(1)
> instead of
> sprayed across buffers in the SGA.
>
> ok, crawling back into the cave to work on the blog
>
> kevinclosson.wordpress.com
>
>
> ------------------------------
> *From:* oracle-l-bounce_at_freelists.org [mailto:
> oracle-l-bounce_at_freelists.org] *On Behalf Of *Vlad Sadilovskiy
> *Sent:* Sunday, December 10, 2006 12:03 PM
> *To:* Mladen Gogala
> *Cc:* knecht.stefan_at_gmail.com; Hemant K Chitale; oracle-l
> *Subject:* Re: I/O and db_file_multiblock_read_count
>
>
> And what did I say that was different from your first sentence? Second
> sentence I think is wrong. I'll deliberately use explicit tag for parameter
> and system statistics MBRC value to reduce possible misinterpretation.
>
>
>

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