Re: data-checksums

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>, Rakesh Kumar <rakeshkumar464(at)mail(dot)com>
Cc: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Stephen Frost <sfrost(at)snowman(dot)net>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Re: data-checksums
Date: 2018-01-09 20:37:16
Message-ID: 163ee8df-cae2-484e-5791-c74994d33403@commandprompt.com
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On 01/09/2018 12:22 PM, Andres Freund wrote:
> On 2018-01-09 20:04:04 +0100, Rakesh Kumar wrote:
>>>> I also would like to believe that the hit is small, but when PG
>>>> official document writes "noticeable performance penalty", it becomes
>>>> difficult to convince management that the hit is small :-)
>>> Why believe, when you can measure?
>> yup doing that. But I still feel that PG documentation should stay
>> away from such scare mongering. Or did the lawyers write that :)
> So we should rather lie about it having a potential for performance
> impact? Who'd be helped by that?

It isn't a lie, it depends on the workload and hardware. Adjusting the
documentation to say something like the following probably isn't a bad idea:

The use of the data checksum feature may incur a performance penalty.
However, this does depend on your particular workload and provisioned
hardware. It is wise to test the feature based on your specific
requirements.

JD

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