Gregory Stark wrote:
"Joshua D. Drake" <[EMAIL PROTECTED]> writes:
Gregory Stark wrote:
"Robert Haas" <[EMAIL PROTECTED]> 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
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