What's the difference between database and instance?

Question

Basically, a database is what's written in physical files on disk, while an instance is what runs in memory on a specific computer at a specific time. Your database instance exists only temporarily - it will disappear completely if you shut down your computer, stop the related service or detach the database. 22 янв. 2013 г.

What is the difference between an instance and a database?

While the database includes the application data and metadata stored in physical files on a server, an instance is a combination of the software and memory used to access that data. For example, if you sign in to an Oracle database, your login session is an instance.

What is the relationship between database and instance?

The terms instance and database are closely related, but don't refer to the same thing. 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.

What is the difference between database name and instance name?

SID and instance name are the same thing and identify database instance = processes and memory. Database name identifies database = database files on disk. Service name identifies database instance for Oracle Net i.e. for remote access to database instance.

What does instance mean in database?

A database instance is a set of memory structures that manage database files. A database is a set of physical files on disk created by the CREATE DATABASE statement. The instance manages its associated data and serves the users of the database.

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