Alvaro Herrera <alvhe...@commandprompt.com> wrote: > If you get away with a new page format, let's make sure and > coordinate so that we can add more info into the header. One > thing I wanted was to have an ID struct on each file, so that you > know what DB/relation/segment the file corresponds to. So the > first page's special space would be a bit larger than the others. Couldn't that also be done by burning a bit in the page header flags, without a page layout version bump? If that were done, you wouldn't have the additional information on tables converted by pg_upgrade, but you would get them on new tables, including those created by pg_dump/psql conversions. Adding them could even be made conditional, although I don't know whether that's a good idea.... -Kevin
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