Structure of oracle system table

Name                                                               Null?                                            Type
 -----------------------------------------                            --------                               ----------------------------
 OWNER                                                       NOT NULL                         VARCHAR2(30)
 TABLE_NAME                                           NOT NULL                         VARCHAR2(30)
 TABLESPACE_NAME                                                                            VARCHAR2(30)
 CLUSTER_NAME                                                                                   VARCHAR2(30)
 IOT_NAME                                                                                              VARCHAR2(30)
 STATUS                                                                                                     VARCHAR2(8)
 PCT_FREE                                                                                                NUMBER
 PCT_USED                                                                                                NUMBER
 INI_TRANS                                                                                               NUMBER
 MAX_TRANS                                                                                            NUMBER
 INITIAL_EXTENT                                                                                     NUMBER
 NEXT_EXTENT                                                                                         NUMBER
 MIN_EXTENTS                                                                                          NUMBER
 MAX_EXTENTS                                                                                        NUMBER
 PCT_INCREASE                                                                                        NUMBER
 FREELISTS                                                                                                 NUMBER
 FREELIST_GROUPS                                                                                NUMBER
 LOGGING                                                                                               VARCHAR2(3)
 BACKED_UP                                                                                          VARCHAR2(1)
 NUM_ROWS                                                                                          NUMBER
 BLOCKS                                                                                                  NUMBER
 EMPTY_BLOCKS                                                                                   NUMBER
 AVG_SPACE                                                                                            NUMBER
 CHAIN_CNT                                                                                            NUMBER
 AVG_ROW_LEN                                                                                     NUMBER
 AVG_SPACE_FREELIST_BLOCKS                                                      NUMBER
 NUM_FREELIST_BLOCKS                                                                   NUMBER
 DEGREE                                                                                                  VARCHAR2(10)
 INSTANCES                                                                                            VARCHAR2(10)
 CACHE                                                                                                    VARCHAR2(5)
 TABLE_LOCK                                                                                        VARCHAR2(8)
 SAMPLE_SIZE                                                                                        NUMBER
 LAST_ANALYZED                                                                                DATE
 PARTITIONED                                                                                       VARCHAR2(3)
 IOT_TYPE                                                                                              VARCHAR2(12)
 TEMPORARY                                                                                         VARCHAR2(1)
 SECONDARY                                                                                         VARCHAR2(1)
 NESTED                                                                                                  VARCHAR2(3)
 BUFFER_POOL                                                                                      VARCHAR2(7)
 ROW_MOVEMENT                                                                               VARCHAR2(8)
 GLOBAL_STATS                                                                                    VARCHAR2(3)
 USER_STATS                                                                                          VARCHAR2(3)
 DURATION                                                                                             VARCHAR2(15)
 SKIP_CORRUPT                                                                                    VARCHAR2(8)
 MONITORING                                                                                       VARCHAR2(3)
 CLUSTER_OWNER                                                                              VARCHAR2(30)
 DEPENDENCIES                                                                                   VARCHAR2(8)
 COMPRESSION                                                                                     VARCHAR2(8)
 DROPPED                                                                                               VARCHAR2(3)