DBA_UNDO_EXTENTS

SQL>DESC DBA_UNDO_EXTENTS

 Name                                     Null?    Type

 ------------------------------------------------- ----------------------------
 OWNER                                                                   CHAR(3)
 SEGMENT_NAME                  NOT NULL            VARCHAR2(30)
 TABLESPACE_NAME           NOT NULL            VARCHAR2(30)
 EXTENT_ID                                                            NUMBER
 FILE_ID                                   NOT NULL             NUMBER
 BLOCK_ID                                                              NUMBER
 BYTES                                                                     NUMBER
 BLOCKS                                                                 NUMBER
 RELATIVE_FNO                                                  NUMBER
 COMMIT_JTIME                                                 NUMBER
 COMMIT_WTIME                                            VARCHAR2(20)
 STATUS                                                           VARCHAR2(9)