On Fri, Mar 7, 2014 at 12:36 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote: > > Fabrízio de Royes Mello <fabriziomello@gmail.com> writes: > > Do you think is difficult to implement "ALTER TABLE ... SET UNLOGGED" too? > > Thinking in a scope of one GSoC, of course. > > I think it's basically the same thing. You might hope to optimize it; > but you have to create (rather than remove) an init fork, and there's > no way to do that in exact sync with the commit. So for safety I think > you have to copy the data into a new relfilenode. >
Well, the same thing that 'vacuum full' does, but changing relpersistence to RELPERSISTENCE_UNLOGGED for the new relfilenode. Is this?