Tom Lane wrote:

> I don't see any very good argument for allowing this mechanism to set
> minxid = FrozenXid in the first place.  If there are only frozenXid in
> the table, set minxid = current XID.  That eliminates the entire problem
> at a stroke.

Ok, so I shall go back to the original patch, which did exactly this.
Is it OK for applying?

(I'm using RecentXmin instead of current XID though, because a
currently-running transaction could insert tuples in the table I just
vacuumed.)

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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