28

I found this script sql-server-2005-reaching-table-row-size-limit that seems to return the row size per defined data type lengths. I need a script that would give me all the rows in a table that their max data size is over the recommended 8024 (whatever MS recommends)

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migrated from stackoverflow.com Oct 6 '12 at 6:56

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39

Try this script:

declare @table nvarchar(128)
declare @idcol nvarchar(128)
declare @sql nvarchar(max)

--initialize those two values
set @table = 'YourTable'
set @idcol = 'some id to recognize the row'

set @sql = '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 + ' order by rowsize desc'

PRINT @sql

exec (@sql)

The rows will be ordered by size, so you can check from top to down.

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  • yeah its not applies for varchar I agree.Here above your query is not covering all the columns of a table – AnandPhadke Oct 5 '12 at 11:41
  • @AnandPhadke What columns is not covering? Thanks – Jaime Oct 5 '12 at 12:42
  • Why add one byte for a null column? Is that not zero bytes? Or is it stored internally as #0? – Paul Oct 20 '14 at 18:39
  • 2
    @Paul, it's zero bytes for variable length columns (varchar, nvarchar...), but it is the actual data type length for fixed length columns (int, smallint...), so 1 is kind of an estimation. NULLs are a whole Universe :) (there is also a NULL bitmap mask used to flag NULL values, that takes some space). stackoverflow.com/questions/4546273/… – Jaime Oct 21 '14 at 9:01
  • @Paul it will be stored as zero bytes if SQL Server is using any Data Compression. – d.popov Jan 25 '16 at 13:13
5

I liked the above from Jaime. I added some square brackets to handle weird column names. 

    declare @table nvarchar(128)
    declare @idcol nvarchar(128)
    declare @sql nvarchar(max)

    --initialize those two values
    set @table = 'YourTable'
    set @idcol = 'some id to recognize the row'

    set @sql = 'select ' + @idcol +' , (0'

    select @sql = @sql + ' + isnull(datalength([' + name + ']), 1)' 
            from sys.columns where object_id = object_id(@table)
    set @sql = @sql + ') as rowsize from ' + @table + ' order by rowsize         desc'

    PRINT @sql

    exec (@sql)
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2

And I liked the above from Speedcat and extend it to list all Tables with rowcounts and total bytes.

declare @table nvarchar(128)
declare @sql nvarchar(max)
set @sql = ''
DECLARE tableCursor CURSOR FOR  
SELECT name from sys.tables

open tableCursor
fetch next from tableCursor into @table

CREATE TABLE #TempTable( Tablename nvarchar(max), Bytes int, RowCnt int)

WHILE @@FETCH_STATUS = 0  
begin
    set @sql = 'insert into #TempTable (Tablename, Bytes, RowCnt) '
    set @sql = @sql + 'select '''+@table+''' "Table", sum(t.rowsize) "Bytes", count(*) "RowCnt" from (select (0'

    select @sql = @sql + ' + isnull(datalength([' + name + ']), 1) ' 
        from sys.columns where object_id = object_id(@table)
    set @sql = @sql + ') as rowsize from ' + @table + ' ) t '
    exec (@sql)
    FETCH NEXT FROM tableCursor INTO @table  
end

PRINT @sql

CLOSE tableCursor   
DEALLOCATE tableCursor

select * from #TempTable
select sum(bytes) "Sum" from #TempTable

DROP TABLE #TempTable
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0

try this:

;WITH CTE as(select *,LEN(ISNULL(col1,''))+LEN(ISNULL(col2,'')) as row_len from yourtable)
select * from CTE where row_len > 8060
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