> I don't think that's the name of the parameter, since a Google search
> gives zero hits. There are so many fiddly parameters for this thing
> that I don't want to speculate about which one you meant.
Sorry, subject line had it correct.
http://www.postgresql.org/docs/8.4/static/runtime-config-client.html#GUC-VACUUM-FREEZE-MIN-AGE
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Josh Berkus
PostgreSQL Experts Inc.
www.pgexperts.com