Re: data_checksums enabled by default (was: Move --data-checksums to common options in initdb --help)

On 1/8/21 5:03 AM, Andres Freund wrote:
> On Fri, Jan 8, 2021, at 01:53, Laurenz Albe wrote:
>>
>> The serious crowd are more likely to choose a non-default setting
>> to avoid paying the price for a feature that they don't need.
> 
> I don't really buy this argument. That way we're going to have an ever growing set of things that need to be tuned to have a database that's usable in an even halfway busy setup. That's unavoidable in some cases, but it's a significant cost across use cases.
> 
> Increasing the overhead in the default config from one version to the next isn't great - it makes people more hesitant to upgrade. It's also not a cost you're going to find all that quickly, and it's a really hard to pin down cost.

I'm +1 for enabling checksums by default, even with the performance 
penalties.

As far as people upgrading, one advantage is existing pg_upgrade'd 
databases would not be affected. Only newly init'd clusters would get 
this setting.

Regards,
-- 
-David
david@pgmasters.net