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BI SQL # 203 : SQL Server DBA Scripts : Identify Top Nth heavy I / O Operation

Hi Folks,

In this article we are going to cover How to Identify Top Nth heavy I / O Operation.

In this post we are going to discuss following points:

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

Problem Statement of SQL Script:

How to Identify Top Nth heavy I / O Operation?

Description of SQL Script:

This script will help to identify top Nth heavy I/O Operation.

SQL Script Output Column

image

Input Parameter of SQL Script

VariableValue (@nquery)

SQL Script Code

DECLARE @nquery INT = 20

SELECT TOP (@nquery) (
        SELECT SUBSTRING(est.[text], statement_start_offset / 2 + 
                1, (
                    CASE 
                        WHEN statement_end_offset = - 1
                            THEN LEN(CONVERT(NVARCHAR(max), 
                                        est.[text])) * 2
                        ELSE statement_end_offset
                        END - statement_start_offset
                    ) / 2)
        FROM sys.dm_exec_sql_text(sql_handle) AS est
        ) AS query_text
    ,total_logical_reads / execution_count AS 
    [avg_logical_reads]
    ,qp.query_plan
    ,total_logical_writes / execution_count AS 
    [avg_logical_writes]
    ,total_worker_time / execution_count AS [avg_cpu_cost]
    ,execution_count
    ,total_worker_time
    ,total_logical_reads
    ,total_logical_writes
    ,(
        SELECT DB_NAME(dbid) + ISNULL('..' + OBJECT_NAME(objectid
                ), '')
        FROM sys.dm_exec_sql_text([sql_handle])
        ) AS query_database
    ,last_logical_reads
    ,min_logical_reads
    ,max_logical_reads
    ,last_logical_writes
    ,min_logical_writes
    ,max_logical_writes
    ,total_physical_reads
    ,last_physical_reads
    ,min_physical_reads
    ,max_physical_reads
    ,(
        total_logical_reads + (total_logical_writes * 5
            )
        ) / execution_count AS io_weighting
    ,plan_generation_num --into ExpensiveIOoperations
FROM sys.dm_exec_query_stats
OUTER APPLY sys.dm_exec_query_plan([plan_handle]) AS qp
WHERE [dbid] >= 5
    AND (total_worker_time / execution_count) > 100
ORDER BY io_weighting DESC;

SQL Script Output Screenshot

image

User Level to execute

300

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