About the Database Storage Structures |
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Oracle Database Express Edition (Oracle Database XE) is composed of the following storage structures:
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Logical structures such as tablespaces are created and recognized by the database only, and are not known to the operating system.
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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.
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Recovery-related structures such as redo logs and database backups are used to recover the database after an operating system failure, Oracle instance failure, or media (disk) failure. Recovery-related structures are stored in an automatically managed disk storage area called the flash recovery area.
Oracle Database XE completely automates the management of its logical and physical structures and flash recovery area storage. You use the Oracle Database XE graphical user interface to monitor these structures, mostly to understand how much storage your applications have used so far, how much free storage remains, and whether more space is needed for backups.
The following sections provide a closer look at the database and its storage structures. Refer to Figure: Database Storage Structure as you review these sections.
