-- métadonnées des bases et fichiers de toute sles bases

SELECT * 
FROM   sys.databases;

SELECT SUM(size) * 8 / SQUARE(1024) AS SIZE_GB,
       type_desc, 
       SUM(SUM(size) * 8 / SQUARE(1024)) OVER() AS TOTAL_SIZE_GB
FROM   sys.master_files
GROUP  BY type_desc
ORDER  BY type_desc;

SELECT SUM(size) * 8 / SQUARE(1024) AS SIZE_GB,
       db.name, 
       SUM(SUM(size) * 8 / SQUARE(1024)) OVER() AS TOTAL_SIZE_GB
FROM   sys.master_files AS mf
       JOIN sys.databases AS db
          ON mf.database_id = db.database_id
GROUP  BY db.name
ORDER  BY SIZE_GB DESC;


SELECT SUM(size) * 8 / SQUARE(1024) AS SIZE_GB,
       db.name, type_desc,
       SUM(SUM(size) * 8 / SQUARE(1024)) OVER() AS TOTAL_SIZE_GB
FROM   sys.master_files AS mf
       JOIN sys.databases AS db
          ON mf.database_id = db.database_id
GROUP  BY db.name, type_desc
ORDER BY type_desc, SIZE_GB DESC;