Tom Lane wrote:
> "Mikheev, Vadim" <vmikheev@SECTORBASE.COM> writes:
> > Required frequency of *successful* vacuum over *all* tables.
> > We would have to remember something in pg_class/pg_database
> > and somehow force vacuum over "too-long-unvacuumed-tables"
> > *automatically*.
>
> I don't think this is a problem now; in practice you couldn't possibly
> go for half a billion transactions without vacuuming, I'd think.
ISTM you forgot that the XID counter (and usage) is global.
You need to have *any* table of *any* database in the instance vacuumed before you are sure. Some
low-traffic DB's might not get vacuumed for years (for example template1).
Jan
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