Re: [WIP] In-place upgrade

Gregory Stark wrote:
> "Joshua D. Drake" <jd@commandprompt.com> writes:
> 
>> Gregory Stark wrote:
>>> "Robert Haas" <robertmhaas@gmail.com> writes:
>>> An old page which never goes away. New page formats are introduced for a
>>> reason -- to support new features. An old page lying around indefinitely means
>>> some pages can't support those new features. Just as an example, DBAs may be
>>> surprised to find out that large swathes of their database are still not
>>> protected by CRC checksums months or years after having upgraded to 8.4 (or
>>> even 8.5 or 8.6 or ...). They would certainly want a way to ensure all their
>>> data is upgraded.
>> Then provide a manual mechanism to convert all pages?
> 
> The origin of this thread was the dispute over this claim:
> 
>     1. You *will* need a function to convert a page from old format to new
>     format. We do want to get rid of the old format pages eventually, whether
>     it's during VACUUM, whenever a page is read in, or by using an extra
>     utility. And that process needs to online. Please speak up now if you
>     disagree with that.
> 

I agree.

Joshua D. Drake