Informations about database systems and their web-interfaces

Hello, as help to make a decision for the development of web-based database-applications I'm looking for informations about different database-systems and their suitability for this purpose. Possible systems are Oracle, Informix, Adabas, mSQL, Sybase, Postgres, Access and SQL-Server. Maybe some of you are having experiences with one or more of these database-systems and are able to answer a few questions stated below. Thank you very much for every hint or tip you can give me. ADMINISTRATION: How complicated/extensive is the administration of this database-system? PERFORMANCE: How fast is the access to this database-system? What is the response-time with complex queries and big datavolume? DATAVOLUME: For which datavolume the database-system is qualified? ' up to __________________ records/tables or ' from __________________ records/tables COMMON: How common is the database-system? ' as a 'normal" system ' as a web-based database-system COMMENTS ABOUT THE WEB-INTERFACE: OTHERS: Thank you very much for your efforts! Germar Krueger email: krg@cornelsen.de