Question

我正在使用此博客http://technet.microsoft.com/en-us/library/ms189858(v=sql.110).aspx重新构建/重新组织我的索引。大部分时间它的工作除了少数情况。例如，

SELECT
    dbschemas.[Name] AS 'Schema',
    dbtables.[Name] AS 'Table',
    dbindexes.[Name] AS 'Index',
    indexstats.avg_fragmentation_in_percent,
    indexstats.page_count
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) AS indexstats
INNER JOIN sys.TABLES dbtables
    ON dbtables.[object_id] = indexstats.[object_id]
INNER JOIN sys.schemas dbschemas
    ON dbtables.[schema_id] = dbschemas.[schema_id]
INNER JOIN sys.indexes AS dbindexes
    ON dbindexes.[object_id] = indexstats.[object_id]
    AND indexstats.index_id = dbindexes.index_id
WHERE indexstats.database_id = DB_ID()
ORDER BY indexstats.avg_fragmentation_in_percent DESC

会告诉我这个结果。

Schema  Table                   Index                           avg_fragmentation_in_percent    page_count
---------------------------------------------------------------------------------------------------------
dbo     DealGallery             NULL                                83.3333333333333                7
dbo     UserRewardActions       NULL                                77.2034742987327                56153
dbo     Order                   PK__Order__3214EC275CFA57FE         50                              2
dbo     RetailersTranslations   PK__Retailer__3214EC2736153FBA      50                              2
dbo     Batch                   PK__Batch__3214EC2786046795         50                              2
dbo     BatchProducts           PK__BatchPro__3214EC2709FBECDC      50                              2
dbo     ProductDeals            PK__ProductD__3214EC27CE27FF86      50                              2
dbo     PopTemplates            PK__PopTempl__3214EC279BBD3055      21.0526315789474                19
dbo     ELMAH_Error             NULL                                10.3310852237891                52113

重建上述索引无法正常工作。我正在使用，

ALTER INDEX ALL ON DealGallery  
REBUILD WITH (FILLFACTOR = 80, SORT_IN_TEMPDB = ON,
              STATISTICS_NORECOMPUTE = ON);

ALTER INDEX ALL ON DealGallery  
REORGANIZE ;

也有人可以解释为什么它在Index列中显示为NULL？

Answer 1

重建/重组工作正常。您正在阅读您的查询结果不正确。

dm_db_index_physical_stats fincation有index_id，显示堆和索引信息提示。

   indexstats.index_id = 0 -- Heap or table
   indexstats.index_id > 0 -- Indexes

下面的行将从查询中删除NULL值。

--and indexstats.index_id > 0

    SELECT     dbschemas.[Name] AS 'Schema',
    dbtables.[Name] AS 'Table',
    dbindexes.[Name] AS 'Index',
    indexstats.avg_fragmentation_in_percent,
    indexstats.page_count
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) AS indexstats
INNER JOIN sys.TABLES dbtables
    ON dbtables.[object_id] = indexstats.[object_id]
INNER JOIN sys.schemas dbschemas
    ON dbtables.[schema_id] = dbschemas.[schema_id]
INNER JOIN sys.indexes AS dbindexes
    ON dbindexes.[object_id] = indexstats.[object_id]
    AND indexstats.index_id = dbindexes.index_id
WHERE indexstats.database_id = DB_ID()
and indexstats.index_id > 0
ORDER BY indexstats.avg_fragmentation_in_percent DESC

重建/重组不适用于某些表？

1 个答案: