TABLESPACE creation error
all the guys..

First of all, really appreciate to you all for replying...

When I input the follwing


select   file_name,
         file_id,
         tablespace_name,
         status,online_status 
from     dba_data_files 
order by tablespace_name;


The output is 


FILE_NAME
--------------------------------------------------------------------------------
   FILE_ID TABLESPACE STATUS    ONLINE_
---------- ---------- --------- -------
/home/oracle/db/oradata/ORAC12/ID/sysaux01.dbf
    28 SYSAUX     AVAILABLE ONLINE

/home/oracle/db/oradata/ORAC12/ID/system01.dbf
    27 SYSTEM     AVAILABLE SYSTEM

/home/oracle/db/oradata/ORAC12/ID/ID_user01.dbf
    29 USERS      AVAILABLE ONLINE


There is no such as "VOLUMT" tablespace. When I re-try to create a "TEST01" tablespace, eventhough it's already deleted, it shows 'the file exists already'..

When I get into the directory, there are other SID's as well. And, one of them has "VOLUMT". However, they are different "SID" so they can have same name of tablespace, isn't it?