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Physical and Logical Units of Storage

The database server uses the physical units of storage to allocate disk space. Unlike the logical units of storage whose size fluctuates, each of the physical units has a fixed or assigned size that is determined by the disk architecture. The database server uses the following physical units to manage disk space:

The database server stores data in the following logical units:

The database server maintains the following storage structures to ensure physical and logical consistency of data:

The following sections describe the various data-storage units that the database server supports and the relationships between those units. For information about reserved pages, see the disk structures and storage chapter in the IBM Informix Dynamic Server Administrator's Reference.

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