sql Топ10самыхвостребованныхизотсутствующихиндексовпомнениюSQL

Posted 2021-05-13

SELECT TOP 10
    [ИмяТаблицы] = OBJECT_NAME(sys_indexes.object_id, sys_indexes.database_id),
    [ИздержкиОтсутствия] = ROUND(migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans),0),
    [СреднийПроцентВыигрыша] = migs.avg_user_impact,
    [Поиск] = migs.user_seeks,
    [Просмотр] = migs.user_scans,
    [Использование] = (migs.user_seeks + migs.user_scans),
    [ДатаПоследнегоПоиска] = ISNULL(migs.last_user_seek, CAST('1900-01-01 00:0:00' AS datetime)),
    [ДатаПоследнегоПросмотра] = ISNULL(migs.last_user_scan, CAST('1900-01-01 00:0:00' AS datetime)),
    [ЧислоКомпиляций] = migs.unique_compiles,
    [СредняяСтоимость] = migs.avg_total_user_cost,
    [ОсновныеПоляИндекса] = CASE
        WHEN sys_indexes.equality_columns IS NULL
        AND sys_indexes.inequality_columns IS NULL THEN ''
        WHEN sys_indexes.inequality_columns IS NULL THEN sys_indexes.equality_columns
        WHEN sys_indexes.equality_columns IS NULL THEN sys_indexes.inequality_columns
        ELSE sys_indexes.equality_columns + ', ' + sys_indexes.inequality_columns
        END,
    [ДополнительныеПоляИндекса] = ISNULL(sys_indexes.included_columns,'')
FROM sys.dm_db_missing_index_groups AS mig
    JOIN sys.dm_db_missing_index_group_stats AS migs
    ON migs.group_handle = mig.index_group_handle
    JOIN sys.dm_db_missing_index_details AS sys_indexes
    ON mig.index_handle = sys_indexes.index_handle
ORDER BY [ИздержкиОтсутствия] Desc