问索引数据行大小不返回实际大小？

EN

CREATE TABLE dbo.overhead ( myID INT NOT NULL ) ;

CREATE CLUSTERED INDEX CIX_overhead -- not unique!
ON dbo.overhead(myID) ;

INSERT  INTO dbo.overhead
        ( myID )
        SELECT  1 ;


SELECT  min_record_size_in_bytes ,
        max_record_size_in_bytes

FROM    sys.dm_db_index_physical_stats(DB_ID(), OBJECT_ID(N'dbo.overhead'),

                                       NULL, NULL, N'SAMPLED') ;



min_record_size_in_bytes   max_record_size_in_bytes

------------------------ ------------------------

25                         25