The Database
The database consists of two parts the database and the instance. So what is the difference?
To understand the difference between a database and an instance, we need to know the basic definition of each and the relationship between them.
Definition:
A database is a set of files stored on disk.
An instance is a collection of Oracle background processes and shared memory.
Relationship:
An instance can mount and open one and only one database.
A database may be mounted and opened by one or more instances.
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