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BI SQL # 184 : SQL Server DBA Scripts : Pending IO Requests

Hi Folks,

In this article we are going to cover Pending IO Requests.

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:

    Find Pending IO Requests.

    Description of SQL Script:

    This Transact-SQL script lists all Pending IO Requests.

    SQL Script Output Column

    image

    SQL Script Code

    WITH pir
    AS (
        SELECT PIR.scheduler_address
            ,COUNT(*) AS PendIoRequests
            ,SUM(PIR.io_pending_ms_ticks) AS PendWaitTime
        FROM sys.dm_io_pending_io_requests AS PIR
        GROUP BY PIR.scheduler_address
        )
        ,req
    AS (
        SELECT ER.task_address
            ,COUNT(*) AS ReqCnt
            ,COUNT(DISTINCT ER.database_id) AS ReqDbCnt
            ,SUM(ER.wait_time) AS ReqWaitTime
        FROM sys.dm_exec_requests AS ER
        GROUP BY ER.task_address
        )
    SELECT OS.scheduler_id AS Scheduler
        ,OS.cpu_id AS CpuId
        ,CASE 
            WHEN OS.scheduler_id < 1048576
                THEN 'Query'
            ELSE 'Internal'
            END AS Scheduler
        ,OS.[status] AS OsStatus
        ,OS.current_workers_count AS CurrWrk
        ,OS.active_workers_count AS ActWrk
        ,OS.pending_disk_io_count AS pDiskIo
        ,OW.pending_io_count AS pIoCount
        ,OW.pending_io_byte_count AS pIoBytes
        ,OW.[state] AS WorkerState
        ,req.ReqDbCnt
        ,req.ReqCnt
        ,req.ReqWaitTime
        ,pir.PendIoRequests
        ,pir.PendWaitTime
    FROM sys.dm_os_schedulers AS OS
    INNER JOIN sys.dm_os_workers AS OW ON OS.active_worker_address = OW
        .worker_address
    -- Change it to INNER join to get only pending schedulers 
    LEFT JOIN pir ON pir.scheduler_address = OS.scheduler_address
    LEFT JOIN req ON req.task_address = OW.task_address
    ORDER BY OS.scheduler_id;

    SQL Script Output Screenshot

    image

    User Level to execute

    300

    Hope you will like to Pending IO Requests.

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