few questions ..?

Hi All,     I have few questions, kindly suggest your comments on this..
    1. Is that postgres supports distributed database ?           In oracle, by creating Dblink we can communicate the
remorte
 
database from the local one. How you could  implement this in postgres 
database.
    2. Is there any way to cache the table on memorry ?          In oracle, we can use the cache statement at the table
creation
 
itself.
    3. List out the main tuning parameters in postgres.conf to take care of 
supporing millions of records.


Thanks & Regards
Vijay

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