On 4 February 2013 17:02, Andres Freund <and...@2ndquadrant.com> wrote:

> I unfortunately don't yet see a robust way without storing the last used
> horizon :(.

We can't go backwards, but we can go forwards.

We can move the next xid forwards by an amount equal to the increase
in vacuum_defer_cleanup_age.

-- 
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services


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