troubleshooting Question

Rebuilding indexes and fragmentation. Why do I see different fragmentation levels with these scripts?

Avatar of NBF
NBF asked on
Microsoft SQL Server
2 Comments1 Solution503 ViewsLast Modified:
Why does the first script show me indexes over 1000 page count that have hardly any fragmentation but when I run the 2nd script it shows me a list of indexes that are heavily fragmented that also have over 1000 pages.

What is the different between these two scripts?

DECLARE @DatabaseID int

SET @DatabaseID = DB_ID()

SELECT DB_NAME(@DatabaseID) AS DatabaseName,
       schemas.[name] AS SchemaName,
       objects.[name] AS ObjectName,
       indexes.[name] AS IndexName,
       objects.type_desc AS ObjectType,
       indexes.type_desc AS IndexType,
       dm_db_index_physical_stats.partition_number AS PartitionNumber,
       dm_db_index_physical_stats.page_count AS [PageCount],
       dm_db_index_physical_stats.avg_fragmentation_in_percent AS AvgFragmentationInPercent
FROM sys.dm_db_index_physical_stats (@DatabaseID, NULL, NULL, NULL, 'LIMITED') dm_db_index_physical_stats
INNER JOIN sys.indexes indexes ON dm_db_index_physical_stats.[object_id] = indexes.[object_id] AND dm_db_index_physical_stats.index_id = indexes.index_id
INNER JOIN sys.objects objects ON indexes.[object_id] = objects.[object_id]
INNER JOIN sys.schemas schemas ON objects.[schema_id] = schemas.[schema_id]
WHERE objects.[type] IN('U','V')
AND objects.is_ms_shipped = 0
AND indexes.[type] IN(1,2,3,4)
AND indexes.is_disabled = 0
AND indexes.is_hypothetical = 0
AND dm_db_index_physical_stats.alloc_unit_type_desc = 'IN_ROW_DATA'
AND dm_db_index_physical_stats.index_level = 0
AND dm_db_index_physical_stats.page_count >= 1000



SELECT SO.name AS TABLE_NAME,
       SI.name AS INDEX_NAME,
       SO.type_desc,
       DMV.index_type_desc,
       DMV.alloc_unit_type_desc,
       DMV.index_depth,
       DMV.index_level,
       DMV.page_count,
       DMV.avg_fragmentation_in_percent,
       DMV.partition_number
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, 'LIMITED') as DMV
LEFT OUTER JOIN sys.objects AS SO
ON DMV.OBJECT_ID = SO.OBJECT_ID
LEFT OUTER JOIN sys.indexes AS SI
ON DMV.OBJECT_ID = SI.OBJECT_ID
AND DMV.INDEX_ID = SI.INDEX_ID
WHERE alloc_unit_type_desc = 'IN_ROW_DATA'
      AND page_count > 1000
      AND avg_fragmentation_in_percent > 20
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