Determine how much space each table uses:
Source: http://arcanecode.com/2008/01/28/getting-table-space-usage-in-sql-server-2005/

/*———————————————————————————*/
/* Drop the temp table if it’s there from a previous run */
/*———————————————————————————*/
if object_id(N‘tempdb..[#TableSizes]‘) is not null
 drop table #TableSizes ;
go

/*—————————————————————————-*/
/* Create the temp table  */
/*—————————————————————————-*/
create table #TableSizes
(
[Table Name] nvarchar(128)   /* Name of the table */
, [Number of Rows] char(11)    /* Number of rows existing in the table. */
, [Reserved Space] varchar(18) /* Reserved space for table. */
, [Data Space] varchar(18)    /* Amount of space used by data in table. */
, [Index Size] varchar(18)    /* Amount of space used by indexes in table. */
, [Unused Space] varchar(18)   /* Amount of space reserved but not used. */
) ;

go

/*—————————————————————————-*/
/* Load the temp table   */
/*—————————————————————————-*/
declare @schemaname varchar(256) ;

– Make sure to set next line to the Schema name you want!
set @schemaname = ‘dbo’ ;

– Create a cursor to cycle through the names of each table in the schema
declare curSchemaTable cursor

for select sys.schemas.name + ‘.’ + sys.objects.name
from    sys.objects
, sys.schemas
where   object_id > 100
and sys.schemas.name = @schemaname

/* For a specific table uncomment next line and supply name */
–and sys.objects.name = ’specific-table-name-here’
and type_desc = ‘USER_TABLE’
and sys.objects.schema_id = sys.schemas.schema_id ;
open curSchemaTable ;

declare @name varchar(256) ;  /* This holds the name of the current table*/

– Now loop thru the cursor, calling the sp_spaceused for each table
fetch curSchemaTable into @name ;
while ( @@FETCH_STATUS = 0 )
begin
insert into #TableSizes
exec sp_spaceused @objname = @name ;
fetch curSchemaTable into @name ;
end

– Important to both close and deallocate!
close curSchemaTable ;
deallocate curSchemaTable ;

/*—————————————————————————-*/
/* Feed the results back */
/*—————————————————————————-*/
select [Table Name]
, [Number of Rows]
, [Reserved Space]
, [Data Space]
, [Index Size]
, [Unused Space]
from    [#TableSizes]
order by [Table Name] ;

/*—————————————————————————-*/
/* Remove the temp table */
/*—————————————————————————-*/
drop table #TableSizes ;

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