sql server检查索引是否丢失

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT TOP 100
         ROUND(s.avg_total_user_cost * s.avg_user_impact * ( s.user_seeks
                                                             + s.user_scans ),
               0) AS [Total Cost] ,
         s.avg_total_user_cost * ( s.avg_user_impact / 100.0 ) * ( s.user_seeks
                                                               + s.user_scans ) AS Improvement_Measure ,
         DB_NAME() AS DatabaseName ,
         d.[statement] AS [Table Name] ,
         equality_columns ,
         inequality_columns ,
         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
 WHERE   s.avg_total_user_cost * ( s.avg_user_impact / 100.0 ) * ( s.user_seeks
                                                               + s.user_scans ) > 10
 ORDER BY [Total Cost] DESC ,
         s.avg_total_user_cost * s.avg_user_impact * ( s.user_seeks
                                                       + s.user_scans ) DESC