Can a database instance have multiple databases?

Can an Oracle instance have multiple databases?

As long as all your database instances are on the same server you can build as many as you want without paying any more.

How many databases does an RDS instance have?

Starting today, Amazon RDS for SQL Server supports up to a maximum of 100 databases per database instance. The Microsoft system databases, such as master and model, don't count toward this limit. Existing database instances can support up to 100 databases without any downtime.

Can one RDS have multiple databases?

By default, customers are allowed to have up to a total of 40 Amazon RDS DB instances. Of those 40, up to 10 can be Oracle or SQL Server DB Instances under the "License Included" model.

What is the difference between a database and an instance?

The database is the set of files where application data (the reason for a database) and meta data is stored. An instance is the software (and memory) that Oracle uses to manipulate the data in the database. In order for the instance to be able to manipulate that data, the instance must open the database.