SQL - SQL Server - Find Unused Indexes

Source: Helpful functions when you need to find out what is going on on SQL Server (github.com)

/* FIND UNUSED INDEXES - MIGHT AFFECT LOG WRITES */

SELECT o.name Object_Name,
i.name Index_name, 
i.Type_Desc
FROM sys.objects AS o
JOIN sys.indexes AS i
ON o.object_id = i.object_id 
LEFT OUTER JOIN 
sys.dm_db_index_usage_stats AS s 
ON i.object_id = s.object_id 
AND i.index_id = s.index_id
WHERE o.type = 'u'
-- Clustered and Non-Clustered indexes
AND i.type IN (1, 2) 
-- Indexes without stats
AND (s.index_id IS NULL) OR
-- Indexes that have been updated but not used
(s.user_seeks = 0 AND s.user_scans = 0 AND s.user_lookups = 0 );

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