El siguiente script en TSQL lista todas las bases de datos con sus respectivos tamaños en Megas y Gigas.
SELECT DB_NAME(db.database_id) DatabaseName, round((CAST(mfrows.RowSize AS FLOAT)*8)/1024,2) RowSizeMB, round((CAST(mflog.LogSize AS FLOAT)*8)/1024,2) LogSizeMB, round((CAST(mfrows.RowSize AS FLOAT)*8)/1024+(CAST(mflog.LogSize AS FLOAT)*8)/1024,2) DBSizeMB, round((CAST(mfrows.RowSize AS FLOAT)*8)/1024/1024+(CAST(mflog.LogSize AS FLOAT)*8)/1024/1024,2) DBSizeGB FROM sys.databases db LEFT JOIN (SELECT database_id, SUM(size) RowSize FROM sys.master_files WHERE type = 0 GROUP BY database_id, type) mfrows ON mfrows.database_id = db.database_id LEFT JOIN (SELECT database_id, SUM(size) LogSize FROM sys.master_files WHERE type = 1 GROUP BY database_id, type) mflog ON mflog.database_id = db.database_id LEFT JOIN (SELECT database_id,SUM(size) StreamSize FROM sys.master_files WHERE type = 2 GROUP BY database_id, type) mfstream ON mfstream.database_id = db.database_id LEFT JOIN (SELECT database_id, SUM(size) TextIndexSize FROM sys.master_files WHERE type = 4 GROUP BY database_id, type) mftext ON mftext.database_id = db.database_id ORDER BY 4 DESC
Complementa al siguiente script para listar las bases de datos con su ubicación:
https://maurobernal.com.ar/blog/blog/t-sql/listar-todas-las-bases-de-datos-con-su-respectiva-ubicacion-y-tamanos/