Re: Query on Real application testing

As per my understanding , flash cache is a persistent storage area and thus a flashback database should not wipe out blocks, storage indexes etc from the storage cell flash cache. I am not sure about the DB buffer cache(it may get wiped off) and other RAT replay processes(other than application queries) and how much overhead DB buffer cache warmup will add to the RAT replay though. Others may comment on this.

On Sun, Oct 24, 2021 at 4:02 PM Lok P <loknath.73_at_gmail.com> wrote:

> Hi, We are planning to use the real application testing feature of Oracle
> for capturing and replaying production workloads to see the actual impact
> of one of our coming versions and hardware upgrades. We have one question-
> As before each workload replay the RAT database has to be flashed back to
> the point in time where we have captured the workload from. So will that
> flashback, remove everything from the RAT DB buffer cache and also
> everything will be wiped out from the storage server flash cache? And in
> that case the replay may not mimic the exact impact as the cache warmup
> will be adding additional overhead to the resource and time and thus it may
> not be a good comparison of before and after upgrade behaviour of RAT
> database. Can you please confirm if this is the correct understanding and
> how we should replay then to avoid this cache warmup thing? And if any
> other RAT system related resources can also deviate the figures?
>
> Regards
> Lok
>

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