Tom Lane wrote:
Pallav Kalva <pkalva@xxxxxxxxxxxxxxxxx> 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?
If nothing changed on these tables how can it freeze old tuples ?
Does it mean that once it reaches 200M transactions it will do the same
thing all over again ?
If I am doing just SELECTS on these tables ? how can there be any
transactions ? or SELECTS considered transactions too ?
regards, tom lane
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