Top 20 queries.sql

-- http://msdn.microsoft.com/ko-kr/library/ms189741.aspx

SELECT TOP 20 query_stats.query_hash AS "Query Hash", 
    SUM(query_stats.total_worker_time) / SUM(query_stats.execution_count)/1000 AS "Avg CPU Time",
    MIN(query_stats.statement_text) AS "Statement Text"
FROM 
    (SELECT QS.*, 
    SUBSTRING(ST.text, (QS.statement_start_offset/2) + 1,
    ((CASE statement_end_offset 
        WHEN -1 THEN DATALENGTH(ST.text)
        ELSE QS.statement_end_offset END 
            - QS.statement_start_offset)/2) + 1) AS statement_text
     FROM sys.dm_exec_query_stats AS QS
     CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) as ST) as query_stats
GROUP BY query_stats.query_hash
ORDER BY 2 DESC;