sqlserver计算表使用大小sql

--计算一个数据库中所有表的大小
declare @id            NVARCHAR(100)
create table #spt_space
(
    [name]            NVARCHAR(50) null,
    [rows]          int null,
    [reserved]       NVARCHAR(50) null,
    [data]         NVARCHAR(50) null,
    [index_size]        NVARCHAR(50) null,
    [unused]         NVARCHAR(50) null
)
 
set nocount on
 
declare c_tables cursor for
select name from sysobjects where xtype = 'U'
 
open c_tables fetch next from c_tables into @id
 
while @@fetch_status = 0
begin
    /* Code from sp_spaceused */
    insert into #spt_space ([name],[rows],reserved,data,index_size,unused)
    EXEC sp_spaceused @id
    fetch next from c_tables   into @id
 
end
SELECT * FROM(
SELECT *,CAST(REPLACE(reserved,'KB','') AS float(3))/(1024*1024) AS reservedindex FROM #spt_space
) c
order by c.reservedindex desc
 
drop table #spt_space
close c_tables
deallocate c_tables

--粗算一个表的记录大小

declare @lengh int;
declare @i int;
declare @tableName varchar(20);
DECLARE @SQLString NVARCHAR(500)

declare   @a   table   (a   int,b   varchar(100)) ;
set @tableName='tblDetail';


create table #spt_space
(
    [name]            NVARCHAR(50) null,
    [rows]          int null,
    [reserved]       NVARCHAR(50) null,
    [data]         NVARCHAR(50) null,
    [index_size]        NVARCHAR(50) null,
    [unused]         NVARCHAR(50) null
)
 
insert into #spt_space ([name],[rows],reserved,data,index_size,unused)
EXEC sp_spaceused @tableName;

declare @record_size int;
set @record_size = (select sum(length) from syscolumns  where object_name(id)=@tableName);
select cast(rows as numeric(16))*@record_size /(1024*1024*1024) ,@record_size as record_size ,rows from   #spt_space 

drop table #spt_space;