Understanding Oracle Database Logical and Physical Structures.

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An Oracle database is made up of physical and logical structures.

Physical structures are those that can be seen and operated on from the operating system, such as the physical files that store data on disk.

Logical structures are created and recognized by the Oracle database server and are not known to the operating system. The primary logical structure in a database, a tablespace, contains physical files. The applications developer or end user may be aware of the logical structure, but is not usually aware of this physical structure.

The DBA must understand the relationship between the physical and logical structures of a database.

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