On 10/10/07, Tom Lane <[EMAIL PROTECTED]> wrote: > "Marko Kreen" <[EMAIL PROTECTED]> writes: > > IMHO the core operations are already as stable as PostgreSQL use > > of MVCC, as the module just exports backend internal state... > > Well, it exports backend internal state that did not exist before 8.2 > (ie, XID epoch). So it doesn't seem all that set in stone to me.
Ok. Lets say the API concepts are 6-7 years old. The epoch was a only thing missing in API ca. 2 years ago (the 8byte txid was written on 8.0), so now the API is complete. > > Another thing can can be done is more compact representation for > > txid_snapshot type, but that also won't affect core operation. > > That's another thing that's likely to become very much harder to change > once it's in core. People keep threatening to produce a working > in-place-upgrade process, and once that's reality the on-disk > representation of core types is going to be hard to change. Good point. But txid_snapshot happens to have couple of free bits that can be used to create backwards compatibility, so I don't think that could be a big problem. Anyway, the in-place upgrade seems a month-two away couple of years now :) -- marko ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
