Re: Block-level CRC checks

On Thu, Oct 30, 2008 at 11:27 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> "Jonah H. Harris" <jonah.harris@gmail.com> writes:
>> On Thu, Oct 30, 2008 at 11:14 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> 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.
>
>> Most of the other databases I've worked, which don't have different
>> types of pages, put the page version as the first element of the page.
>>  That would let us put the crc right after it.  Thoughts?
>
> "Fixed location" does not mean "let's move it".

Just trying to be helpful.  Just thought I might give some insight as
to what others, who had implemented in-place upgrade functionality
years before Postgres' existence, had done.

-- 
Jonah H. Harris, Senior DBA
myYearbook.com