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
