查询总共要查询的数据量

    CREATE TABLE #tablespaceinfo
        (
          nameinfo VARCHAR(50) ,
          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    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   

    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]

查询总共要查询的数据量