Re: Block-level CRC checks

"Jonah H. Harris" <jonah.harris@gmail.com> writes:
> On Thu, Oct 30, 2008 at 10:33 AM, Zdenek Kotala <Zdenek.Kotala@sun.com> wrote:
>> Please, DO NOT MOVE position of page version in PageHeader structure! And
>> PG_PAGE_LAYOUT_VERSION should be bump to 5.

> Umm, any in-place upgrade should be capable of handling changes to the
> page header.

Well, yeah, but it has to be able to tell which version it's dealing
with.  I quite agree with Zdenek that keeping the version indicator
in a fixed location is appropriate.
        regards, tom lane