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  1. Oracle PL/SQL Tutorial
  2. System Tables Data Dictionary
  3. dba_extents
30.30.dba_extents
30.30.1.Join dba_extents and dba_rollback_segs
30.30.2.Query dba_extents for segment name
30.30.3.Query DBA_EXTENTS for Extent number in the segment, Starting block number for the extent, Size of the extent in bytes, Size of the extent, in Oracle blocks
30.30.4.Query DBA_EXTENTS for Name of the segment, Type of segment (ex. TABLE, INDEX)
30.30.5.Query DBA_EXTENTS for Tablespace name,Owner of the segment
30.30.6.Log dba_extents