If you want to get a list of all tablespaces used in the current database instance, you can use the DBA_TABLESPACES view as shown in the following SQL script example:

SQL> connect SYSTEM/globalguideline

Connected.

SQL> col tablespace_name format a16;

SQL> col file_name format a36;

SQL> SELECT TABLESPACE_NAME, FILE_NAME, BYTES

2 FROM DBA_DATA_FILES;

TABLESPACE_NAME FILE_NAME     BYTES

--------------- ------------------------------- ---------

USERS   ORACLEXEORADATAXEUSERS.DBF 104857600

SYSAUX  ORACLEXEORADATAXESYSAUX.DBF 461373440

UNDO  ORACLEXEORADATAXEUNDO.DBF 94371840

SYSTEM  ORACLEXEORADATAXESYSTEM.DBF 356515840