Re: pg_upgrade project status

Zdenek Kotala wrote:
> In the last week community made decision about pg_upgrade project and its
> implementation. I would like to try summarize this conclusion and I add other
> topic which should be finished for 8.4.
>
> Convert on read has been selected as a good way, because it is not invasive and
> does not limit fresh database. But, this way needs core modification which
> allows to do online in-place upgrade. It means no online in-place upgrade to 8.4
> will be implemented. Sorry about that, but we need move forward and there is not
> easy way without core modification to do it.
>
> As I mentioned manytimes before there are two major issues with convert on read
> and one small issue.
>
> 1) Data does not fit on the new page. It will be solve by pre-upgrade check
> which reserve space on each page, before upgrade.

Rather than specifying free space as an amount, I was thinking of having
a boolean like 'ready_for_upgrade' and the system internally would know
how much free space for each page and tuple.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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