In this post, I am sharing a script for finding the size of Indexes in SQL Server.
I also shared different DBA scripts on SQL Server Indexes as Find the fragmentation of Indexes, Indexes Statistics.

SQL Server: Script to find Index Average Fragmentation in Percentage

SQL Server: Script to find Outdated Index Statistics

Using the below script, you can get the size of indexes of a SQL database:

SELECT
    i.name AS IndexName
    ,SUM(s.used_page_count) * 8 AS IndexSizeInKB
FROM sys.dm_db_partition_stats AS s 
INNER JOIN sys.indexes AS i
	ON s.[object_id] = i.[object_id] AND s.index_id = i.index_id
WHERE s.[object_id] = object_id('dbo.Table_Name')
GROUP BY i.name
ORDER BY i.name

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

In this post, I am sharing a T-SQL script to find an average percentage of index fragmentation in SQL Server.

When we are not getting the desired performance of the index, we should check the average percentage of Index Fragmentation.
The non-clustered index data stores into different pages, so there is always a chance of fragmentation.

I prepared a script to find index fragmentation, and if you see the index fragmentation, you should execute INDEX REBUILD or INDEX REORGANIZE on highly fragmented indexes to achieve the good performance of indexes.

SELECT object_name(ips.object_id) AS TableName
	,i.name AS IndexName
	,ips.index_type_desc AS IndexType
	,ips.avg_fragmentation_in_percent 
	,ips.fragment_count
	,ips.page_count
FROM sys.dm_db_index_physical_stats (DB_ID(),NULL, NULL, NULL ,NULL) AS ips
INNER JOIN sys.indexes AS i ON ips.OBJECT_ID = i.OBJECT_ID
	AND ips.index_id = i.index_id