Bonjour,

Il y a plein de solutions

L'une d'entre elles :

SELECT A.tablespace_Name, A.Alloue, B.Occupe, C.Libre
2 FROM (select tablespace_name, sum(bytes)/1024/1024 AS ALLOUE from dba_data_files group by tablespace_name) a,
3 (select tablespace_name, Sum(bytes)/1024/1024 AS OCCUPE from dba_segments group by tablespace_name) b,
4 (select tablespace_name, Sum(bytes)/1024/1024 AS LIBRE from dba_free_space group by tablespace_name) c
5 WHERE B.tablespace_Name = A.tablespace_Name
6 AND C.Tablespace_Name = B.Tablespace_Name;

Google en donne pourtant un tas : essaye comme critères de recherches "connaitre la taille d'un tablespace"