| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Checksums by default? |
| Date: | 2017-01-22 10:14:22 |
| Message-ID: | 30f8280c-a34f-056a-2f5a-a0030ef99227@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 01/21/2017 04:18 PM, Petr Jelinek wrote:
> On 21/01/17 11:39, Magnus Hagander wrote:
>> Is it time to enable checksums by default, and give initdb a switch to
>> turn it off instead?
>
> I'd like to see benchmark first, both in terms of CPU and in terms of
> produced WAL (=network traffic) given that it turns on logging of hint bits.
>
... and those hint bits may easily trigger full-page writes, resulting
in significant write amplification.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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