Re: 32/64-bit transaction IDs?

On Friday March 21 2003 11:53, Tom Lane wrote:
> "Ed L." <pgsql@bluepolka.net> writes:
> >> XIDs are issued in transaction start order, not transaction commit
> >> order.  Dunno if that's what's concerning you.
> >
> > Yes, I'm interested in any reliable ordering of transaction commits for
> > the purpose of serial asyncronous replication.  Is that possible?
>
> The order in which commit records are inserted into the WAL log would
> work (and if you just need an ID number, the commit records' WAL-log
> addresses are 64-bits and would serve nicely).  But you'll have to add
> code to the backend to get at that.

A 64-bit serial ID number would suffice.  I could spend a little time on
that.  Any starter hints on files/functions/structure of such an addition?
Something akin to GetTransactionId()?

Ed