Craig A. James wrote:
> Alvaro Herrera wrote:
> >>If I only insert data into a table, never update or delete, then I should
> >>never have to vacuum it. Is that correct?
> >
> >You still need to vacuum eventually, to avoid transaction Id wraparound
> >issues. But not as often.
>
> Thanks. Any suggestions for what "not as often" means? For example, if my
> database will never contain more than 10 million rows, is that a problem?
> 100 million rows? When does transaction ID wraparound become a problem?
Transaction ID wraparound will be a problem at a bit less than 2 billion
transactions. So if you vacuum the table every 1 billion transactions
you are safe. I suggest you read the "routine maintenance" section in
the docs; the wraparound issue is explained there.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
