What is 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's the difference between database and 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.

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 is the difference between database schema and instance?

Schema refers to the overall description of any given database. Instance basically refers to a collection of data and information that the database stores at any particular moment. The schema remains the same for the entire database as a whole.

What is the difference between instance and server?

A server is a (physical or virtual) machine hosting SQL Server software. An instance is a collection of SQL Server databases run by a single SQL Server service, ahem, instance. You can view each separate instance you're running in your service console. Each instance can be started or stopped individually.

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