CHARPTER 3--INDEX DMVs

1.查找最重要的缺失的索引　

--=======================================================
--查找最重要的缺失的索引
SELECT TOP(20)
DB_NAME() AS DBName,
ROUND(s.avg_total_user_cost*s.avg_user_impact
*(S.user_seeks+S.user_scans),0) AS [TotalCost],
D.[statement] AS TableName,
D.equality_columns,
D.inequality_columns,
D.included_columns
INTO #TB1
FROM sys.dm_db_missing_index_groups G
INNER JOIN sys.dm_db_missing_index_group_stats S
ON S.group_handle=G.index_group_handle
INNER JOIN sys.dm_db_missing_index_details D
ON D.index_handle=G.index_handle

EXEC sp_MSforeachdb '
USE [?]
INSERT INTO #TB1
SELECT TOP(20)
DB_NAME() AS DBName,
ROUND(s.avg_total_user_cost*s.avg_user_impact
*(S.user_seeks+S.user_scans),0) AS [TotalCost],
D.[statement] AS TableName,
D.equality_columns,
D.inequality_columns,
D.included_columns
FROM sys.dm_db_missing_index_groups G
INNER JOIN sys.dm_db_missing_index_group_stats S
ON S.group_handle=G.index_group_handle
INNER JOIN sys.dm_db_missing_index_details D
ON D.index_handle=G.index_handle
ORDER BY TotalCost DESC'

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