Pallav Kalva <pkalva@livedatagroup.com> writes:
> We turned on autovacuums on 8.2 and we have a database which is read
> only , it is basically a USPS database used only for address lookups
> (only SELECTS, no updates/deletes/inserts).
> This database has about 10gig data and yesterday autovacuum started
> on this database and all of a sudden I see lot of archive logs generated
> during this time, I guess it might have generated close to 3-4gig data
> during this period.
Probably represents freezing of old tuples, which is a WAL-logged
operation as of 8.2. Is it likely that the data is 200M transactions
old?
regards, tom lane