Answer / wafa

data block is the smallest unit of logical storage for a database object. As objects grow they take chunks of additional storage that are composed of contiguous data blocks. These groupings of contiguous data blocks are called extents. All the extents that an object takes when grouped together are considered the segment of the database object.

Answer / gaya

The oracle server manages the storage space in the datafiles
in units called oracle blocks or data blocks.

A segment is the space allocated for a specific logical
storage structure within a tablespace.

Space is allocated to a segment by extents.One or more
extents make up a segments.

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