namespace in pgsql

Hi,

I am newbie for pgsql..... Im using Solaris.....

1) Is it possible to have namespace like in OOP, in pgsql query.....
means as I know we can reference table or its column with fashion like
<schema>.<table_name>, but is it possible like
<db_name>.<schema>.<table_name> ???

2) Is it fine if I store all data in one db ( well most of the table
with 2000+ rows ) ? OR better to created 2-3 dbs and store those
tables...

Thanks in advance...... (" ,)