FAQ 4.15 "What is an OID? What is a TID?" is misleading about the
uniqueness of OIDs. It does mention the possibility of overflow
(while mentioning that nobody has ever reported it), but it doesn't
discourage their use as primary keys like the documentation does
in, for example, the following sections:
http://www.postgresql.org/docs/8.0/static/datatype-oid.html
http://www.postgresql.org/docs/8.0/static/ddl-system-columns.html
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Michael Fuhr
http://www.fuhr.org/~mfuhr/