PostgreSQL: Defining a primary key on a large database

Question

I am planing a database to store lots of text. (blog posts, news articles, etc.) The database needs to have the title, content (50k characters max), date, link and language

Answer 1

I would use an ordinary 32bit integer as a primary key. I don't think you will exceed that number very soon :-) The whole Wikipedia has about 3,5 millions articles... If you wrote 1000 articles per day it would take almost 6000 years to reach the maximum of the integer type.