06.索引-非聚集索引-堆表

Posted 2020-08-17 ywnwa417

删除聚集索引

DROP INDEX CIX_Employee001_Id ON Employee001

 

索引情况

 

 

SELECT

database_id,

index_id,

index_type_desc,

index_depth,

index_level,

page_count

FROM sys.dm_db_index_physical_stats(DB_ID(‘IndexDB‘),OBJECT_ID(‘Employee001‘),null,null,null)

 

 

 

 

 

 

TRUNCATE TABLE DBCCIndResult

INSERT INTO DBCCIndResult EXEC(‘DBCC IND(IndexDB,Employee001,-1)‘)

 

 

SELECT *

FROM DBCCIndResult

WHERE PageType=2

AND IndexID =3

 

 

 

 

找到根

 

 

 

 

 

查看根页

 

DBCC TRACEON(3604)

DBCC PAGE (IndexDB, 1, 442, 3);

 

 

 

 

这时 由于没有聚集索引了，所以也就没有Id(Key)，取而代之的是HEAP RID 也就是RID 行定位器

 

这个指针（RID）由页里行的（文件号：页号：槽号，file identifier ：page number ：slot number）组成

可以通过下面的方式 查看

 

 

DECLARE@HeapRidBINARY(8)

SET @HeapRid = 0xB800000001003E00

SELECT     

       CONVERT (VARCHAR(5),

                    CONVERT(INT, SUBSTRING(@HeapRid, 6, 1)

                               + SUBSTRING(@HeapRid, 5, 1)))

     + ‘:‘

     + CONVERT(VARCHAR(10),

                    CONVERT(INT, SUBSTRING(@HeapRid, 4, 1)

                               + SUBSTRING(@HeapRid, 3, 1)

                               + SUBSTRING(@HeapRid, 2, 1)

                               + SUBSTRING(@HeapRid, 1, 1)))

     + ‘:‘

          + CONVERT(VARCHAR(5),

                    CONVERT(INT, SUBSTRING(@HeapRid, 8, 1)

                               + SUBSTRING(@HeapRid, 7, 1)))

                               AS ‘Fileid:Pageid:Slot‘

 

 

 

 

 

 

 

 

 

 

 

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