SQL Server Mentalist

BI SQL # 204 : SQL Server DBA Scripts : Identify Top Nth waits With I / O Specification

November 24, 2013 7:00 am

Hi Folks,

In this article we are going to cover How to Identify Top Nth waits With I / O Specification.

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:

How to Identify Top Nth waits With I / O Specification ?

Description of SQL Script:

This script will help to identify top Nth waits With I / O Specification.

SQL Script Output Column

SQL Script Code

WITH Waits
AS (
    SELECT wait_type
        ,wait_time_ms / 1000. AS wait_time_s
        ,100. * wait_time_ms / SUM(wait_time_ms) OVER (
            ) AS pct
        ,ROW_NUMBER() OVER (
            ORDER BY wait_time_ms DESC
            ) AS rn
    FROM sys.dm_os_wait_stats
    WHERE wait_type NOT IN (
            'CLR_SEMAPHORE'
            ,'LAZYWRITER_SLEEP'
            ,'RESOURCE_QUEUE'
            ,'SLEEP_TASK'
            ,'SLEEP_SYSTEMTASK'
            ,'SQLTRACE_BUFFER_FLUSH'
            ,'WAITFOR'
            ,'LOGMGR_QUEUE'
            ,'CHECKPOINT_QUEUE'
            ,'REQUEST_FOR_DEADLOCK_SEARCH'
            ,'XE_TIMER_EVENT'
            ,'BROKER_TO_FLUSH'
            ,'BROKER_TASK_STOP'
            ,'CLR_MANUAL_EVENT'
            ,'CLR_AUTO_EVENT'
            ,'DISPATCHER_QUEUE_SEMAPHORE'
            ,'FT_IFTS_SCHEDULER_IDLE_WAIT'
            ,'XE_DISPATCHER_WAIT'
            ,'XE_DISPATCHER_JOIN'
            )
    )
--Insert into OptimizationFinal.perf.TopWaitsInServer
SELECT W1.wait_type
    ,CAST(W1.wait_time_s AS DECIMAL(12, 2)) AS wait_time_s
    ,CAST(W1.pct AS DECIMAL(12, 2)) AS pct
    ,CAST(SUM(W2.pct) AS DECIMAL(12, 2)) AS running_pct 
    --Into TopWaitsInServer
FROM Waits AS W1
INNER JOIN Waits AS W2 ON W2.rn <= W1.rn
GROUP BY W1.rn
    ,W1.wait_type
    ,W1.wait_time_s
    ,W1.pct
HAVING SUM(W2.pct) - W1.pct < 80;-- percentage threshold

SQL Script Output Screenshot

User Level to execute

300

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Posted by Vishal Pawar

Categories: Link, Microsoft SQL Server, MSBI, Optimization, Query, Script, SQL Mentalist, SQL PraRup, SQL Query, SQL Server, Technology,, TSQL, Vishal Pawar

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