Uwe Maiwald <[EMAIL PROTECTED]> writes:
> we are currently planning a very large installation of a web-application 
> using PostgreSQL. The application can be configured to handle 1 database 
> per customer, or all customers in one large database.

> We plan to start with e.g. 500 customers, each of which can have 200 MB or 
> more in the database. And we want the system to be expandable as needed 
> (thousands of customers, using lots of memory).

The one-big-database approach would scale better, but is performance
your only consideration?  Separate databases would enforce strict
separation between customers, which might be either a good thing or
a bad thing depending on your needs.

                        regards, tom lane

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