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Table spaces

 Tablespace consists of one or more data files.

 A data file belongs to only one tablespace.

Segments, Extents, and Blocks

• Segments exist within a tablespace

• Segments are made up of a collection of extents

• An extents is a collection of logically contiguous

data blocks

- Cannot span multiple data files

• Data blocks are mapped to disk blocks


SYSTEM and SYSAUX Tablespaces

• The SYSTEM and SYSAUX tablespaces are mandatory tablespaces.

• They are created at the time of database creation.

• They must be online.

• The SYSTEM tablespace is used for core functionality (for example, data

dictionary tables).

• The auxiliary SYSAUX tablespace is used for additional database components.

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