MS SQL Server má pohled , ze kterého můžete zjistit, které indexy by vám pomohli a zároveň o kolik. Rozhodně zajímavé informace, které z vás zadarmo udělají tuning guru :-D


SELECT CAST(SERVERPROPERTY('ServerName') AS [nvarchar](256)) AS [SQLServer]
	,db.[database_id] AS [DatabaseID]
	,db.[name] AS [DatabaseName]
	,id.[object_id] AS [ObjectID]
	,id.[statement] AS [FullyQualifiedObjectName]
	,id.[equality_columns] AS [EqualityColumns]
	,id.[inequality_columns] AS [InEqualityColumns]
	,id.[included_columns] AS [IncludedColumns]
	,gs.[unique_compiles] AS [UniqueCompiles]
	,gs.[user_seeks] AS [UserSeeks]
	,gs.[user_scans] AS [UserScans]
	,gs.[last_user_seek] AS [LastUserSeekTime]
	,gs.[last_user_scan] AS [LastUserScanTime]
	,gs.[avg_total_user_cost] AS [AvgTotalUserCost]
	,gs.[avg_user_impact] AS [AvgUserImpact]
	,gs.[system_seeks] AS [SystemSeeks]
	,gs.[system_scans] AS [SystemScans]
	,gs.[last_system_seek] AS [LastSystemSeekTime]
	,gs.[last_system_scan] AS [LastSystemScanTime]
	,gs.[avg_total_system_cost] AS [AvgTotalSystemCost]
	,gs.[avg_system_impact] AS [AvgSystemImpact]
	,gs.[user_seeks] * gs.[avg_total_user_cost] * (gs.[avg_user_impact] * 0.01) AS [IndexAdvantage]
	,'CREATE INDEX [Missing_IXNC_' + OBJECT_NAME(id.[object_id], db.[database_id]) + '_' + REPLACE(REPLACE(REPLACE(ISNULL(id.[equality_columns], ''), ', ', '_'), '[', ''), ']', '') + CASE 
		WHEN id.[equality_columns] IS NOT NULL
			AND id.[inequality_columns] IS NOT NULL
			THEN '_'
		ELSE ''
		END + REPLACE(REPLACE(REPLACE(ISNULL(id.[inequality_columns], ''), ', ', '_'), '[', ''), ']', '') + '_' + LEFT(CAST(NEWID() AS [nvarchar](64)), 5) + ']' + ' ON ' + id.[statement] + ' (' + ISNULL(id.[equality_columns], '') + CASE 
		WHEN id.[equality_columns] IS NOT NULL
			AND id.[inequality_columns] IS NOT NULL
			THEN ','
		ELSE ''
		END + ISNULL(id.[inequality_columns], '') + ')' + ISNULL(' INCLUDE (' + id.[included_columns] + ')', '') AS [ProposedIndex]
	,CAST(CURRENT_TIMESTAMP AS [smalldatetime]) AS [CollectionDate]
FROM [sys].[dm_db_missing_index_group_stats] gs WITH (NOLOCK)
INNER JOIN [sys].[dm_db_missing_index_groups] ig WITH (NOLOCK)
	ON gs.[group_handle] = ig.[index_group_handle]
INNER JOIN [sys].[dm_db_missing_index_details] id WITH (NOLOCK)
	ON ig.[index_handle] = id.[index_handle]
INNER JOIN [sys].[DATABASES] db WITH (NOLOCK)
	ON db.[database_id] = id.[database_id]
WHERE id.[database_id] >4 -- Remove this to see for entire instance
ORDER BY [IndexAdvantage] DESC
OPTION (RECOMPILE);

 

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