On Sat, Dec 24, 2011 at 03:56:58PM +0000, Simon Riggs wrote: > > Also, as far as I can see this patch usurps the page version field, > > which I find unacceptably short-sighted. Do you really think this is > > the last page layout change we'll ever make? > > No, I don't. I hope and expect the next page layout change to > reintroduce such a field. > > But since we're agreed now that upgrading is important, changing page > format isn't likely to be happening until we get an online upgrade > process. So future changes are much less likely. If they do happen, we > have some flag bits spare that can be used to indicate later versions. > It's not the prettiest thing in the world, but it's a small ugliness > in return for an important feature. If there was a way without that, I > would have chosen it.
Have you considered the CRC might match a valuid page version number? Is that safe? -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
