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BI SQL # 178 : SQL Server DBA Scripts : List expensive queries MAIN

Hi Folks,

In this article we are going to cover How to List expensive queries MAIN.

In this post we are going to discuss following points:

  • Problem Statement of SQL Script:
  • Description of SQL Script:
  • SQL Script Output Column
  • SQL Script Code
  • SQL Script Output Screenshot
  • User Level to execute

Problem Statement of SQL Script:

Get List of expensive queries.

Description of SQL Script:

This Transact-SQL script will help in find mainly expensive queries

In terms of Average CPU execution time or Average logical operations

SQL Script Output Column

image

SQL Script Code

DECLARE @MinExecutions INT;

SET @MinExecutions = 5

SELECT EQS.total_worker_time AS TotalWorkerTime
    ,EQS.total_logical_reads + EQS.total_logical_writes AS 
    TotalLogicalIO
    ,EQS.execution_count AS ExeCnt
    ,EQS.last_execution_time AS LastUsage
    ,EQS.total_worker_time / EQS.execution_count AS 
    AvgCPUTimeMiS
    ,(EQS.total_logical_reads + EQS.total_logical_writes
        ) / EQS.execution_count AS AvgLogicalIO
    ,DB.NAME AS DatabaseName
    ,SUBSTRING(EST.TEXT, 1 + EQS.statement_start_offset / 2, (
            CASE 
                WHEN EQS.statement_end_offset = - 1
                    THEN LEN(convert(NVARCHAR(max), EST.TEXT)) 
                        * 2
                ELSE EQS.statement_end_offset
                END - EQS.statement_start_offset
            ) / 2) AS SqlStatement
-- Optional with Query plan; remove comment to show, but then the query 
takes !!much longer time!! 
--,EQP.[query_plan] AS [QueryPlan] 
FROM sys.dm_exec_query_stats AS EQS
CROSS APPLY sys.dm_exec_sql_text(EQS.sql_handle) AS EST
CROSS APPLY sys.dm_exec_query_plan(EQS.plan_handle) AS EQP
LEFT JOIN sys.databases AS DB ON EST.dbid = DB.database_id
WHERE EQS.execution_count > @MinExecutions
    AND EQS.last_execution_time > DATEDIFF(MONTH, - 1, GETDATE())
ORDER BY AvgLogicalIo DESC
    ,AvgCPUTimeMiS DESC

SQL Script Output Screenshot

image

User Level to execute

200

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