Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)

On Tue, Mar 21, 2017 at 10:01 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
>> I think that very wide columns and highly indexed tables are not
>> particularly unrealistic, nor do I think updating all the rows is
>> particularly unrealistic.  Sure, it's not everything, but it's
>> something.  Now, I would agree that all of that PLUS unlogged tables
>> with fsync=off is not too realistic.  What kind of regression would we
>> observe if we eliminated those last two variables?
>
> Sure, we can try that.  I think we need to try it with
> synchronous_commit = off, otherwise, WAL writes completely overshadows
> everything.

synchronous_commit = off is a much more realistic scenario than fsync = off.

-- 
Robert Haas
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