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Oracle instances, databases, server differences

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Example (instance)

An instance is a non-fixed, memory-based basic process and memory structure. When the server shuts down, the instance does not exist.

Databases (database)

Database refers to fixed, disk-based data files, control files, log files, parameter files, archive log files. In general, a database contains one instance.

Database server

The database server generally refers to the database software part (SQLPLUS,EXP/IMP,OEM), the instance, the database three parts. is made up of all the software and services installed on the server after the successful startup.

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