As I am preparing important scripts for SQL Server DBA, so here I am also sharing one more vital script for finding the unused indexes of SQL Server Database.

The management and maintenance of database index is a day to day exercise for a Database Administrator. The wrong or unused index can create performance issues for a frequently used table.

At every insert and update, the data of an index are also changing, and it requires some IO operations. Better to find the unused index and delete it.
I also added “DropStatement” column in script for dropping unused Indexes.

SELECT 
	OBJECT_NAME(i.OBJECT_ID) AS ObjectName
	,i.name AS UnusedIndexName	
	,8 * SUM(au.used_pages) AS IndexSizeInKB
	,CASE
		WHEN i.type = 0 THEN 'Heap'  
		WHEN i.type= 1 THEN 'Clustered' 
		WHEN i.type=2 THEN 'Non-Clustered'   
		WHEN i.type=3 THEN 'XML'   
		WHEN i.type=4 THEN 'Spatial'  
		WHEN i.type=5 THEN 'Clustered columnstore index'   
		WHEN i.type=6 THEN 'Nonclustered columnstore index'  
		WHEN i.type=7 THEN 'Nonclustered hash index.'
	END index_type
	,'DROP INDEX ' + i.name + ' ON ' + OBJECT_NAME(i.OBJECT_ID) AS DropStatement
FROM sys.indexes AS i 
LEFT JOIN sys.dm_db_index_usage_stats AS dius 
	ON dius.OBJECT_ID = i.OBJECT_ID 
		AND i.index_id = dius.index_id 
		AND dius.database_id = DB_ID() 
INNER JOIN sys.partitions AS p 
	ON p.OBJECT_ID = i.OBJECT_ID 
		AND p.index_id = i.index_id 
INNER JOIN sys.allocation_units AS au 
	ON au.container_id = p.partition_id 
WHERE OBJECTPROPERTY(i.OBJECT_ID, 'IsIndexable') = 1 
	AND OBJECTPROPERTY(i.OBJECT_ID, 'IsIndexed') = 1 
	AND dius.index_id IS NULL
	OR (dius.user_updates > 0 
		AND dius.user_seeks = 0 
		AND dius.user_scans = 0 
		AND dius.user_lookups = 0)
GROUP BY OBJECT_NAME(i.OBJECT_ID), i.name, i.type 
ORDER BY OBJECT_NAME(i.OBJECT_ID)

Other SQL Server Index related DBA Scripts:

SQL Server: Script to find Redundant and Duplicate Indexes

SQL Server: Script to find Index Average Fragmentation in Percentage

SQL Server: Script to find Missing Indexes

SQL Server: Script to find Index Operational Stats