On K, 2005-08-17 at 16:45 -0400, Tom Lane wrote:
> Hannu Krosing <hannu@skype.net> writes:
> > On K, 2005-08-17 at 14:48 -0400, Tom Lane wrote:
> >> While testing this I realized that it does not in fact work as
> >> advertised. It will only exclude long-running VACUUMs from other
> >> VACUUMs' OldestXmin if *all* the transactions in the system are lazy
> >> VACUUMs. If there is even one regular transaction in the system,
> >> that transaction will include the VACUUMs in its MyProc->xmin, and
> >> thence GetOldestXmin will have to include them in its result.
>
> > Only if these regular transactions are running in SERIALIZABLE isolation
> > level, else MyProc->xmin is not set inside GetSnapshotData.
>
> Better read the code again. The first snap in *any* transaction sets
> MyProc->xmin.
Can't find the place :(
Could you point to the file / function that does this.
--
Hannu Krosing <hannu@skype.net>
