如何计算 SQL 表大小？答案

【问题标题】：How to calculate SQL Table Size?如何计算 SQL 表大小？
【发布时间】：2022-06-16 19:04:31
【问题描述】：

我有兴趣在 SQL 中计算表的实际大小。我也有兴趣查看行的平均大小以及行的平均大小

【问题讨论】：

标签： sql

【解决方案1】：

--< Check total size of table>
DECLARE @table NVARCHAR(128)
DECLARE @idcol NVARCHAR(128)
DECLARE @sql NVARCHAR(MAX)

--initialize those two values
SET @table = 'YourTable'
SET @idcol = 'RowIdentifier'

SET @sql = 'WITH Table_CTE AS (SELECT SUM((0'

SELECT @sql = @sql + ' + isnull(datalength(' + name + '), 1)' 
        FROM  sys.columns 
        WHERE object_id = OBJECT_ID(@table)
        AND   is_computed = 0
SET @sql = @sql + ')) as TableSize from ' + @table + ') SELECT (CASE WHEN TableSize < 1000000 THEN
           CONCAT(CEILING(TableSize / 1024.0), ''KB'')
      ELSE 
           CONCAT(FORMAT(TableSize / 1048576.0, ''N3''), ''MB'')
 END) AS ' + @table + '_TableSize FROM Table_CTE'

PRINT @sql

exec (@sql)
--</Check total size of table>

和

--< Check average size of table row>
DECLARE @table NVARCHAR(128)
DECLARE @idcol NVARCHAR(128)
DECLARE @sql NVARCHAR(MAX)

--initialize those two values
SET @table = 'YourTable'
SET @idcol = 'RowIdentifier'

SET @sql = 'WITH Table_CTE AS (SELECT AVG((0'

SELECT @sql = @sql + ' + isnull(datalength(' + name + '), 1)' 
        FROM  sys.columns 
        WHERE object_id = OBJECT_ID(@table)
        AND   is_computed = 0
SET @sql = @sql + ')) as TableSize from ' + @table + ') SELECT (CASE WHEN TableSize < 1000000 THEN
           CONCAT(FORMAT(TableSize / 1024.0, ''N3''), ''KB'')
      ELSE 
           CONCAT(FORMAT(TableSize / 1048576.0, ''N3''), ''MB'')
 END) AS ' + @table + '_AvgRowSize FROM Table_CTE'

PRINT @sql

exec (@sql)
--</Check average size of table row>

和

--< Check size of each table row>
declare @table nvarchar(128)
declare @idcol nvarchar(128)
declare @sql nvarchar(max)

--initialize those two values
set @table = 'YourTable'
set @idcol = 'RowIdentifier'

set @sql = 'WITH Table_CTE AS (select ' + @idcol +' , (0'

select @sql = @sql + ' + isnull(datalength(' + name + '), 1)' 
        from  sys.columns 
        where object_id = object_id(@table)
        and   is_computed = 0
set @sql = @sql + ') as rowsize from ' + @table + ') SELECT ' + @idcol + ', (CASE WHEN rowsize < 1000000 THEN
           CONCAT(FORMAT(rowsize / 1024.0, ''N3''), ''KB'')
      ELSE 
           CONCAT(FORMAT(rowsize / 1048576.0, ''N3''), ''MB'')
 END) AS RowSize FROM Table_CTE' + ' order by rowsize desc'

PRINT @sql

exec (@sql)
--< Check size of each table row>

【讨论】：