Re: [HACKERS] getting rid of SnapshotNow

(2013/07/18 21:46), Robert Haas wrote:
> There seems to be a consensus that we should try to get rid of
> SnapshotNow entirely now that we have MVCC catalog scans, so I'm
> attaching two patches that together come close to achieving that goal:

...

> With that done, the only remaining uses of SnapshotNow in our code
> base will be in currtid_byreloid() and currtid_byrelname().  So far no
> one on this list has been able to understand clearly what the purpose
> of those functions is, so I'm copying this email to pgsql-odbc in case
> someone there can provide more insight.  If I were a betting man, I'd
> bet that they are used in contexts where the difference between
> SnapshotNow and SnapshotSelf wouldn't matter there, either.

Using SnapshotSelf instead of SnapshotNow for currtid_ () wouldn't
  matter.

regards,
Hiroshi Inoue