Consulta que permite saber el espacio usado y lod registros de las tablas de una bbdd de SQL Server:
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SELECT t.NAME AS NombreTabla, s.Name AS Esquema, p.rows AS NumFilas, SUM(a.total_pages) * 8 AS EspacioTotal_KB, SUM(a.used_pages) * 8 AS EspacioUsado_KB, (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS EspacioNoUsado_KB FROM sys.tables t INNER JOIN sys.indexes i ON t.OBJECT_ID = i.object_id INNER JOIN sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id INNER JOIN sys.allocation_units a ON p.partition_id = a.container_id LEFT OUTER JOIN sys.schemas s ON t.schema_id = s.schema_id WHERE t.NAME NOT LIKE 'dt%' AND t.is_ms_shipped = 0 AND i.OBJECT_ID > 255 GROUP BY t.Name, s.Name, p.Rows ORDER BY EspacioUsado_KB desc |
fuente: StackoverFlow