查看数据库表的数据量和SIZE大小的脚本修正

在使用桦仔的分享一个SQLSERVER脚本（计算数据库中各个表的数据量和每行记录所占用空间）的脚本时，遇到下面一些错误

这个是因为这些表的Schema是Maint，而不是默认的dbo，造成下面这段SQL在执行EXEC sp_spaceused @tablename时出现

Msg 15009, Level 16, State 1, Procedure sp_spaceused, Line 75

The object 'xxxx' does not exist in database 'YourSQLDba' or is invalid for this operation.

DECLARE Info_cursor CURSOR
FOR
    SELECT  '[' + [name] + ']'
    FROM    sys.tables
    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

修正后的脚本如下所示

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  '[' + s.[name] +']' +'.' + '[' + t.[name] + ']'
    FROM    sys.tables t
    INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
    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 ) PERSISTED
    )

--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]