I am new to Oracle. I have created a database named sales. The oracle SID for this database is also sales. I want to know if I have to run multiple instances how do I do that. I mean do I have to create another database for each instance using dbassist or is there a way I can use the same database I created for other instances ie the same datafiles, redologs and all .. Please bear in mind that I am new to Oracle . Also I would appreciate if someone sends me a document about how to configure multiple instances.