![]() The physical storage structures are simply files that store data. The following section briefly describes the physical and logical storage structure of an Oracle Database. One of the essential tasks of the Oracle Database is to store data. However, it would be unusable because it is just a set of files. In a clustering environment, many instances on several servers can access a central database to enable high availability and scalability.įinally, a database can exist without an instance. Third, multiple database instances can access the same database. And an instance can mount only one database at a single point in time. When you start an instance, the next step is to mount that instance to a database. Second, an instance can access only one database at a time. This is how you create a database, starting an instance first and creating the database from within the instance. However, it is important to understand the distinctions between the two.įirst, you can start a database instance without having it accessing any database files. Sometimes, a database instance is referred to as an entire running database. The following picture illustrates the Oracle Database server architecture. Database and InstanceĪn Oracle Database consists of a database and at least one instance.Īn instance, or database instance, is the combination of memory and processes that are a part of a running installation and a database is a set of files that store data. Oracle Database is commonly referred to as Oracle RDBMS or simply Oracle. ![]() Oracle Database is an object-relational database management system developed and marketed by Oracle Corporation. Summary: in this tutorial, you will learn about the Oracle Database architecture and its components.
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