SQL> select tablespace_name
  2  from dba_segments
  3  where segment_name = 'DEPT'
  4  and owner = 'SCOTT';

TABLESPACE_NAME
------------------------------
USERS

SQL> select index_name,table_name,status
  2  from dba_indexes
  3  where owner = 'SCOTT'
  4  and table_name = 'DEPT';

INDEX_NAME                     TABLE_NAME                     STATUS
------------------------------ ------------------------------ --------
PK_DEPT                        DEPT                           VALID

SQL> alter table SCOTT.DEPT move tablespace EXAMPLE;

Table altered.

SQL> select index_name,table_name,status
  2  from dba_indexes
  3  where owner = 'SCOTT'
  4  and table_name = 'DEPT';

INDEX_NAME                     TABLE_NAME                     STATUS
------------------------------ ------------------------------ --------
PK_DEPT                        DEPT                           UNUSABLE

SQL> alter index SCOTT.PK_DEPT rebuild;

Index altered.

SQL> select index_name,table_name,status
  2  from dba_indexes
  3  where owner = 'SCOTT'
  4  and table_name = 'DEPT';

INDEX_NAME                     TABLE_NAME                     STATUS
------------------------------ ------------------------------ --------
PK_DEPT                        DEPT                           VALID

SQL> select tablespace_name
  2  from dba_segments
  3  where segment_name = 'DEPT'
  4  and owner = 'SCOTT';

TABLESPACE_NAME
------------------------------
EXAMPLE

SQL>