Multiple instances in Oracle 9i

Hi All!
In Oracle 9i, if I have 2 databases on the same server, does that mean I have 2 different instances , one for each database, OR the concept of multiple instances is only in te parallel server?

I suppose it depends on your definition of the terminology.
Here is Oracle's definition of each:
Instance: Consists of the SGA Memory structure and background processes used to manage a database. An instance is identified byusign methods specific to each operating system. The instance can open and use only one database at a time.
Database: An Oracle database is a collection of data that is treated as a unit. The general purpose of a database is to store and retrieve related information. The database has a logical structure and a physical structure. The physical structure of the database is the set of operating syste files in the database. An Oracle database consists of three files types: Data files, Redo Logs, Control Files. (note: parameter file, password file, and archive logs are not considered part of the database)
So to answer your questions, if you have two separate Oracle instances on your machine, I would say you have both two instances and two databases.

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