SQLSERVER：计算数据库中各个表的数据量和每行记录所占用空间

CREATE TABLE #tablespaceinfo
(
nameinfo VARCHAR(500) ,
rowsinfo BIGINT ,
reserved VARCHAR(20) ,
datainfo VARCHAR(20) ,
index_size VARCHAR(20) ,
unused VARCHAR(20)
)

DECLARE @tablename VARCHAR(255);

DECLARE Info_cursor CURSOR
FOR
SELECT  '[' + [name] + ']'
FROM    sysobjects
WHERE   type = 'U';

OPEN Info_cursor
FETCH NEXT FROM Info_cursor INTO @tablename

WHILE @@FETCH_STATUS = 0
BEGIN
INSERT  INTO #tablespaceinfo
EXEC sp_spaceused @tablename
FETCH NEXT FROM Info_cursor
INTO @tablename
END

CLOSE Info_cursor
DEALLOCATE Info_cursor

--创建临时表
CREATE TABLE [#tmptb]
(
TableName VARCHAR(50) ,
DataInfo BIGINT ,
RowsInfo BIGINT ,
Spaceperrow  AS ( CASE RowsInfo
WHEN 0 THEN 0
ELSE CAST(DataInfo AS decimal(18,2))/CAST(RowsInfo AS decimal(18,2))
END )
)

--插入数据到临时表
INSERT  INTO [#tmptb]
( [TableName] ,
[DataInfo] ,
[RowsInfo]
)
SELECT  [nameinfo] ,
CAST(REPLACE([datainfo], 'KB', '') AS BIGINT) AS 'datainfo' ,
[rowsinfo]
FROM    #tablespaceinfo
ORDER BY CAST(REPLACE(reserved, 'KB', '') AS INT) DESC

--汇总记录
SELECT  [tbspinfo].* ,
[tmptb].[Spaceperrow] AS '每行记录大概占用空间（KB）'
FROM    [#tablespaceinfo] AS tbspinfo ,
[#tmptb] AS tmptb
WHERE   [tbspinfo].[nameinfo] = [tmptb].[TableName]
ORDER BY CAST(REPLACE([tbspinfo].[reserved], 'KB', '') AS INT) DESC

DROP TABLE [#tablespaceinfo]
DROP TABLE [#tmptb]