Hi, On Tue, 2004-10-19 at 11:44, Hermann Himmelbauer wrote:

Hi, By adding a Database Adapter I can access my relational database.

What I would like to know is if one database adapter supports multiple sessions, e.g. two scripts can query the database at the same time and not sequentially.

If yes, is there a way to limit concurrent sessions because in my database (MaxDB) I define a maximum number of user processes - if the number exceeds, I get an error message, this should be prevented by somehow queuing database connections that exceed a defined number.

Dont know for MaxDB, but most if not all postgres DAs are fully thread save which means they are ready for concurrent access which happens quite often in web applications. Usually ZopeDAs open as many connections per connection-object as there are threads configured. Your Database has to offer number-of-zope-instances*number-of-threads*number-of-connection-objecs possible connection at the same time. Regards Tino