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'dm_exec_query_stats'에 해당되는 글 1건
2009. 6. 25. 00:13

SQL Server 2005부터 추가된 DMV를 통해 여러 가지 유용한 스크립트를 만들 수 있습니다.

이번에는 특정 DB 또는 모든 DB에 대해 SELECT, DELETE, INSERT 또는 UPDATE Statmemt가
어떠한 비율로 발생하는지 그리고 리소스별 어떠한 비율로 사용하는지 쉽게 확인 할 수 있는 쿼리 입니다.

지금까지 막연하게 "이 DB는 대부분이 SELECT가 발생하는 것이야."
이러한 생각을 구체적이고 정확하게 보여줄 수 있습니다.

처음 접하는 시스템을 분석시 위와 같은 자료가 있으면 보다 쉽게 파악 할 수 있을 것입니다.
제 생각에는 ~ 꽤 DB관련 업무에 유용하게 사용될 수 있을 것 같습니다.ㅎㅎ

아래는 수행한 결과 입니다.
ExecutionCount는 분당 실행한 횟수 입니다.

[로그성 DB시스템]  

[일반 OLTP DB시스템]

with XMLNAMESPACES ('http://schemas.microsoft.com/sqlserver/2004/07/showplan' as sql)

SELECT

       StatementType

       ,ExecutionCount

       ,cast((ExecutionCount*1.0/total_ExecutionCount)*100 as Decimal(18,2)) as [% ExecutionCount]

       ,cast((Elapsed_Time/total_Elapsed_Time)*100 as Decimal(18,2)) as [% Elapsed_Time]

       ,cast((Worker_Time/total_Worker_Time)*100 as Decimal(18,2)) as [% Worker_Time]

       ,cast((logical_reads/total_logical_reads)*100 as Decimal(18,2)) as [% logical_reads]

      ,cast((logical_writes/total_logical_writes)*100 as Decimal(18,2)) as [% logical_writes]

      ,cast((physical_reads/total_physical_reads)*100 as Decimal(18,2)) as [% physical_reads]

FROM

(

       SELECT

             StatementType

             ,sum(avg_ExecutionCount) over(partition by StatementType) as ExecutionCount

             ,sum(avg_ExecutionCount) over(partition by 1) as total_ExecutionCount

             ,sum(avg_total_Elapsed_Time) over(partition by StatementType) as Elapsed_Time

             ,sum(avg_total_Elapsed_Time) over(partition by 1) as total_Elapsed_Time

             ,sum(avg_total_Worker_Time) over(partition by StatementType) as Worker_Time

             ,sum(avg_total_Worker_Time) over(partition by 1) as total_Worker_Time

             ,sum(avg_total_logical_reads) over(partition by StatementType) as logical_reads

             ,sum(avg_total_logical_reads) over(partition by 1) as total_logical_reads

             ,sum(avg_total_logical_writes) over(partition by StatementType) as logical_writes

             ,sum(avg_total_logical_writes) over(partition by 1) as total_logical_writes

             ,sum(avg_total_physical_reads) over(partition by StatementType) as physical_reads

             ,case when

                    sum(avg_total_physical_reads) over(partition by 1) = 0

                           THEN NULL ELSE sum(avg_total_physical_reads) over(partition by 1)

             END    as total_physical_reads

       FROM(

             SELECT StatementType

                    ,count(*) as cnt

                    ,sum(ISNULL(ExecutionCount/DATEDIFF(MINUTE , creation_time,GetDate()),0)) as avg_ExecutionCount

                    ,cast(sum(ISNULL([total_Elapsed_Time(sec)]/DATEDIFF(MINUTE , creation_time, GetDate()), 0)) as Decimal(18,2)) as avg_total_Elapsed_Time

                    ,cast(sum(ISNULL([total_Worker_Time(ms)]/DATEDIFF(MINUTE , creation_time, GetDate()), 0)) as Decimal(18,2)) as avg_total_Worker_Time

                    ,cast(sum(ISNULL([total_logical_reads]/DATEDIFF(MINUTE , creation_time, GetDate()), 0)) as Decimal(18,2)) as avg_total_logical_reads

                    ,cast(sum(ISNULL([total_logical_writes]/DATEDIFF(MINUTE , creation_time, GetDate()), 0)) as Decimal(18,2)) as avg_total_logical_writes

                    ,cast(sum(ISNULL(total_physical_reads/DATEDIFF(MINUTE , creation_time, GetDate()), 0)) as Decimal(18,2)) as avg_total_physical_reads

             FROM (

                           SELECT

                                 db_name

                                 ,ISNULL([StatementType],StatementType2) as StatementType

                                 --,[statement_text]

                                 ,[creation_time]

                                 ,[ExecutionCount]

                                 ,[total_Elapsed_Time(sec)]

                                 ,[total_Worker_Time(ms)]

                                 ,[total_logical_reads]

                                 ,[total_logical_writes]

                                 ,[total_physical_reads]

                           FROM   (

                                              SELECT

                                                     db_name(qp.dbid) AS 'db_name'

                                                     , qs.creation_time

                                                     , qs.execution_count AS 'ExecutionCount'

                                                     , qs.total_elapsed_time/1000.0/1000.0 AS 'total_Elapsed_Time(sec)'

                                                     , qs.total_worker_time/1000.0 AS 'total_Worker_Time(ms)'

                                                     , total_logical_reads

                                                     , qs.total_logical_writes

                                                     , total_physical_reads

                                                     , cast(qp.query_plan as xml) as query_plan

                                              FROM sys.dm_exec_query_stats AS qs

                                                     CROSS APPLY sys.dm_exec_text_query_plan(qs.plan_handle,qs.statement_start_offset,qs.statement_end_offset) qp

                                        )X

                           OUTER APPLY

                                 (

                                 SELECT

                                        c.value('(//sql:StmtSimple/@StatementType)[1]','VARCHAR(100)') AS "StatementType"

                                        ,c.value('(//sql:StmtCond/@StatementType)[1]','VARCHAR(100)') AS "StatementType2"

                                 FROM query_plan.nodes('//sql:QueryPlan')B(C)

                                 )xp

                    WHERE db_id(db_name) > 4

                    AND DATEDIFF(MINUTE,creation_time, GetDate()) > 0

                    AND StatementType is not null

             )X

             group by StatementType

       )Y

)Z



송 혁, SQL Server MVP
sqler.pe.kr // sqlleader.com
hyoksong.tistory.com

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