dba_extents 

 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 OWNER                                              VARCHAR2(30)
 SEGMENT_NAME                                       VARCHAR2(81)
 PARTITION_NAME                                     VARCHAR2(30)
 SEGMENT_TYPE                                       VARCHAR2(18)
 TABLESPACE_NAME                                    VARCHAR2(30)
 EXTENT_ID                                          NUMBER
 FILE_ID                                            NUMBER
 BLOCK_ID                                           NUMBER
 BYTES                                              NUMBER
 BLOCKS                                             NUMBER
 RELATIVE_FNO                                       NUMBER

 

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