sql Unused Indexes

SELECT 
	o.name,
	indexname=i.name,
	i.index_id,
	user_seeks + user_scans + user_lookups As reads,
	user_updates As writes,
	(SELECT SUM(p.rows) FROM sys.partitions p WHERE p.index_id = s.index_id AND s.object_id = p.object_id) As rows,
	CASE
		WHEN s.user_updates < 1 THEN 100
		ELSE 1.00 * (s.user_seeks + s.user_scans + s.user_lookups) / s.user_updates
	END AS reads_per_write,
	'DROP INDEX ' + QUOTENAME(i.name) + ' ON ' + QUOTENAME(c.name) + '.' + QUOTENAME(OBJECT_NAME(s.object_id)) as 'drop statement'
FROM sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON i.index_id = s.index_id AND s.object_id = i.object_id   
INNER JOIN sys.objects o on s.object_id = o.object_id
INNER JOIN sys.schemas c on o.schema_id = c.schema_id
WHERE
	OBJECTPROPERTY(s.object_id,'IsUserTable') = 1
	AND s.database_id = DB_ID()
	AND i.type_desc = 'nonclustered'
	AND i.is_primary_key = 0
	AND i.is_unique_constraint = 0
	AND (SELECT SUM(p.rows) FROM sys.partitions p WHERE p.index_id = s.index_id AND s.object_id = p.object_id) > 10000
ORDER BY reads_per_write Asc
Any indexes with reads of 0 should be removed, as they're not in use.

Updated: Wednesday 25th October 2017, 08:41am

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