I have Fragmented Index on a empty table!

Posted on

Question :

I ran the following query on my database to identify the fragmented indexes. However I surprised when saw the Indexes belong to some empty tables among the highly fragmented indexes! How can it be possible? I assume if there is no data in a table, the index should be blank and can not be fragmented.

    SELECT 
    a.index_id, 
    name, 
    avg_fragmentation_in_percent
FROM 
    sys.dm_db_index_physical_stats(NULL, NULL, NULL, NULL, N'Limited') AS a
    JOIN sys.indexes AS b 
        ON a.object_id = b.object_id 
        AND a.index_id = b.index_id

Could someone give me an explanation?

Thank you in advance.

Nazila

Answer :

Fragmentation values are meaningless for small tables.
An empty (or emptied) table is small.

Small is determined by how many 8k data pages are allocated to it.

For example, see this question: Why is my database still fragmented after I rebuilt and reindexed everything?

Leave a Reply

Your email address will not be published.