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 :)


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