Re: OLTP 10x improvement with exadata and flash write back cache
- From: hrishy <hrishys@xxxxxxxxxxx>
- To: "joshuasingham@xxxxxxxxx" <joshuasingham@xxxxxxxxx>
- Date: Thu, 25 Oct 2012 09:35:34 +0100 (BST)
Hi Joshua
Appreciate your quick response thanks for the clear explanation.
________________________________
From: joshuasingham <joshuasingham@xxxxxxxxx>
To: hrishys@xxxxxxxxxxx
Cc: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
Sent: Thursday, 25 October 2012, 13:04
Subject: Re: OLTP 10x improvement with exadata and flash write back cache
Hi Hrishy ,
I believe if your system is suffering from waits like db file parallel
write,free buffer waits and any similar events you might see improvements
with write back cache, on the 10x improvement I believe it is application
dependent , Also please take note that not all writes go to flash e.g
backup, direct path write and few others so you might not see a improvement
in these areas
Regards
Joshua
On Thu, Oct 25, 2012 at 2:19 PM, hrishy <hrishys@xxxxxxxxxxx> wrote:
> Hi
> Has anybody started using this feature
> https://twitter.com/fritshoogland/status/235146135084351488
>
> of and experienced a 10X improvement in their OLTP applications by
> enabling flash write back cache ?
>
> Under what specific circumstances do you think that 10X improvement is
> possible.
> What bottleneck would motivate us to turn on the exadata flash write back
> cache feature
>
> Can a SSD also achieve the same thing as a flash write back cache ?
>
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