One more side to this which is relevant to other discussions. If I am rewinding back to before when a table was created, the current algorithm as well as any proposed algorithms will delete the reference to the relfilenode in the catalogs but not the file itself. I don't see how an undo subsystem would fix this.
Is this a reason to rethink the idea that maybe a pg_fsck utility might be useful that could be run immediately after a rewind? -- Best Regards, Chris Travers Database Administrator Tel: +49 162 9037 210 | Skype: einhverfr | www.adjust.com Saarbrücker Straße 37a, 10405 Berlin
