重新组织或重建SQL Server堆索引

Question

我有一个存储过程，该存储过程在给定碎片阈值@FragmentationThresholdForReorganizeTableLowerLimit的情况下，检索具有高碎片的索引：

SELECT OBJECT_NAME(IPS.OBJECT_ID) AS [TableName], 
       avg_fragmentation_in_percent, SI.name [IndexName],  
       schema_name(ST.schema_id) AS [SchemaName], fill_factor   
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL , NULL) IPS 
     JOIN sys.tables ST WITH (nolock) ON IPS.OBJECT_ID = ST.OBJECT_ID 
     JOIN sys.indexes SI WITH (nolock) ON IPS.OBJECT_ID = SI.OBJECT_ID AND 
     IPS.index_id = SI.index_id 
WHERE ST.is_ms_shipped = 0 
      AND SI.name IS NOT NULL 
      AND avg_fragmentation_in_percent >= CONVERT(DECIMAL, @FragmentationThresholdForReorganizeTableLowerLimit)  
ORDER BY avg_fragmentation_in_percent DESC 

在我的情况下，@ FragmentationThresholdForReorganizeTableLowerLimit设置为5.0。

然后我遍历所有检索到的索引，并根据avg_fragmentation_in_percent值，我使用以下命令执行REORGANIZE或REBUILD：

ALTER INDEX [IndexName] ON [SchemaName].[Table] REORGANIZE
ALTER INDEX [IndexName] ON [SchemaName].[Table] REBUILD WITH (FILLFACTOR = 100, STATISTICS_NORECOMPUTE = OFF)

执行完上述操作后，如果执行以下查询以查找所有索引的平均碎片百分比，则可以看到尚未重组/重建类型为HEAP的索引：

SELECT a.index_id, name, avg_fragmentation_in_percent, index_type_desc  
FROM sys.dm_db_index_physical_stats (DB_ID(), 
      NULL, NULL, NULL, NULL) AS a  
    JOIN sys.indexes AS b 
      ON a.object_id = b.object_id AND a.index_id = b.index_id
WHERE avg_fragmentation_in_percent > '5.0'
ORDER BY a.avg_fragmentation_in_percent desc;
GO

下面显示查询输出的屏幕截图：

那为什么不重新组织/重建堆索引呢？如何重新组织或重建它们，以消除它们的碎片？

更新： 抱歉，我的错误是，实际上我没有重建堆索引，因为在where子句中使用“ AND SI.name IS NOT NULL”条件时，我将其丢弃。...

那么对于堆索引，由于它们的名称为NULL，我如何引用它们以重建它们？