Using SQL statment to calculation tables space size in database

Along with the growth of the time using ERP system, the database was growing. Apparently caused the ERP application program execution performance, therefore the boss wants to know what space size of the tables in database. Demand what measures.. ?

 Such as delete earlier historical records, etc. So I wrote a Storage process - > Jimmy_calcTablesSpaceSizeInDB

remark by Jimmy on May 25th 2011. 

use AX2009DEV
go

drop PROCEDURE [dbo].[Jimmy_calcTablesSpaceSizeInDB]
go

create procedure [dbo].[Jimmy_calcTablesSpaceSizeInDB]
@dbName     sysname            = '',    --数据库名，默认当前数据库
@tableName  sysname            = '',    --表名，默认全部表
@columnName varchar(50)        = '',    --列名，排序用
@sort       varchar(4)        = ''     --asc升序，desc降序
AS

if (@dbName = '') 
    set @dbName = DB_Name()
else if (Charindex('M0A2_DB2',@dbName) > 0) 
    set @dbName = 'M0A2_DB2.' + @dbName
if (@tableName = '') 
    set @tableName = '%'
if (@columnName = '') 
    set @columnName = 'name'
if (@sort = '') 
    set @sort = 'asc'

exec ('SELECT a.name,rows as int,(reserved * 8) reserved,(data * 8) data,
     ((CASE WHEN used > data THEN (used - data) ELSE 0 END) * 8)index_size,
     ((CASE WHEN reserved > used THEN (reserved - used) ELSE 0 END) * 8)unused 
       FROM ' + @dbName + '.sys.tables a INNER JOIN 
     (SELECT object_id,SUM (reserved_page_count)reserved,SUM (used_page_count)used,
      SUM (CASE
           WHEN (index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
           ELSE lob_used_page_count + row_overflow_used_page_count END)data,
      SUM (CASE 
           WHEN (index_id < 2) THEN row_count ELSE 0    
           END)rows
      FROM ' + @dbName + '.sys.dm_db_partition_stats GROUP BY object_id)b
      ON a.object_id = b.object_id WHERE a.name LIKE ''' + @tableName + ''' ORDER BY ' + @columnName + ' ' + @sort)
go



sp_spaceused 'SysDataBaseLog'

exec Jimmy_calcTablesSpaceSizeInDB '','','data','desc'