TempDB sizing

-- Get the temp sizing for DB
IF OBJECT_ID ('tempdb..#tableSizes') IS NOT NULL
DROP TABLE tempdb..#tableSizes

CREATE TABLE #tableSizes
(
TableName VARCHAR(1000),
EstimatedRowCount BIGINT,
TotalSpaceGB DECIMAL(10,2)
);

DECLARE @DB_Name varchar(100)
DECLARE @Command NVARCHAR(MAX)
DECLARE database_cursor CURSOR FOR
SELECT name
FROM master.sys.sysdatabases WHERE name IN (
'test1',
'test2',
'test3')

OPEN database_cursor

FETCH NEXT FROM database_cursor INTO @DB_Name

WHILE @@FETCH_STATUS = 0
BEGIN

SELECT @Command = 'USE [@DB_Name]
INSERT INTO #tableSizes
SELECT ''['' + DB_NAME() + ''].['' + s.Name + ''].['' + t.NAME + '']'' AS TableName,
p.rows AS EstimatedRowCounts,
CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) / 1024 AS NUMERIC(36, 2)) AS TotalSpaceGB
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
t.Name
'
SELECT @Command = REPLACE(@Command,'@DB_Name',@DB_Name)
EXEC sp_executesql @Command
  FETCH NEXT FROM database_cursor INTO @DB_Name
END

CLOSE database_cursor
DEALLOCATE database_cursor


 SELECT * FROM #tableSizes

 SELECT TOP 1 (TotalSpaceGB)*1.5 AS 'TempDB' FROM #tableSizes ORDER BY TotalSpaceGB DESC