Show Missing Indexes SQL Server

get-missing-indexes.sql

-- This query retrieves and suggests missing index information from the DMV (Dynamic Management Views) in SQL Server.
-- It calculates an improvement measure for each missing index and generates a CREATE INDEX statement to address the missing index.

SELECT
    CONVERT(varchar(30), GETDATE(), 126) AS runtime,
    mig.index_group_handle,
    mid.index_handle,
    CONVERT(decimal(28, 1), migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans)) AS improvement_measure,
    'CREATE INDEX missing_index_' + 
        CONVERT(varchar, mig.index_group_handle) + '_' + 
        CONVERT(varchar, mid.index_handle) + ' ON ' + 
        mid.statement + ' (' + 
        ISNULL(mid.equality_columns, '') + 
        CASE
            WHEN mid.equality_columns IS NOT NULL AND mid.inequality_columns IS NOT NULL THEN ','
            ELSE ''
        END + 
        ISNULL(mid.inequality_columns, '') + ')' + 
        ISNULL(' INCLUDE (' + mid.included_columns + ')', '') AS create_index_statement,
    migs.*,
    mid.database_id,
    mid.[object_id]
FROM
    sys.dm_db_missing_index_groups mig
    INNER JOIN sys.dm_db_missing_index_group_stats migs 
        ON migs.group_handle = mig.index_group_handle
    INNER JOIN sys.dm_db_missing_index_details mid 
        ON mig.index_handle = mid.index_handle
WHERE
    CONVERT(decimal(28, 1), migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans)) > 10
ORDER BY
    migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans) DESC;