Explain the difference between a data block, an extent and
a segment.
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Answer Posted / kumar.s
Datablock, Extent and Segment
A segment is defined as any entity that consumes physical
storage space within the database.
Each Oracle segment is made up of contiguous chunks of
storage space in the database called extents. Every segment
must have at least one extent, but can have as many as 2
billion extents.
Each extent is itself made up of a collection of smaller
chunks of space called Oracle database blocks. The minimum
size of an extent is five database blocks.
The default size of these database blocks is set at
database creation, but Oracle 10g db can use multiple block
sizes within one db. The common database block sizes are
2KB, 4KB, 8KB, and 16KB.
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