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查询索引缺失和无效索引
查询索引缺失： SELECT avg_total_user_cost, avg_user_impact, migs.group_handle, mid.* FROM sys.dm_db_missing_index_group_stats AS migs INNER JOIN sys.dm_db_missing_index_groups AS mig ON ( migs.group_handle = mig.index_group_handle ) INN