Re: Specific questions about wraparound and vacuum

"Nick Fankhauser" <nickf@doxpop.com> writes:
> 1) Do we need to do a *full* vacuum or just a "lazy" vacuum to take care of
> the xid wraparound issues?

Lazy is sufficient --- as long as it's database-wide including the
system catalogs (which means a superuser has to do it).

> Or... is it the case that by one billion, the docs really mean 2^30
> (1073741824) ?

2^30.  You appear to have executed a bit under 600000 transactions since
vacuuming, so if that's three hours then you've got about 5000 hours
until wraparound.

> 4) The documentation implies that I need to vacuum *every* database, even if
> I'm not using them all, so I vacuumed template1, but can't connect to
> template0. Do I really need to vacuum databases where no transactions are
> occurring?   If so, how to I deal with template0?

You don't need to touch frozen databases.  This was discussed yesterday ...

            regards, tom lane