我每5分钟从sys.dm_io_virtual_file_stats中收集IO_STALLS,然后做一个增量查看哪些文件受IO影响最大。
在5分钟内,我得到了5826331毫秒的增量,即97分钟。
我对此有些困惑,这是说一次操作开始于97分钟之前才刚刚完成,因此记录了等待时间吗?
谢谢
根据要求添加了代码:
/*
USE [SysDBA]
GO
*/
/****** Object: Table [dbo].[DISKIOPS] Script Date: 04/07/2013 11:40:15 ******/
/*
DROP TABLE [dbo].[DISKIOPS]
GO
*/
--Create the table
/****** Object: Table [dbo].[DISKIOPS] Script Date: 04/07/2013 11:40:15 ******/
/*
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[DISKIOPS](
[IO_STALL] [bigint] NULL,
[IO_STALL_READ_MS] [bigint] NULL,
[IO_STALL_WRITE_MS] [bigint] NULL,
[NUM_OF_READS] [bigint] NULL,
[NUM_OF_WRITES] [bigint] NULL,
[SIZE_ON_DISK_MB] [bigint] NULL,
[DBNAME] [varchar](max) NULL,
[NAME] [varchar](max) NULL,
[FILE_ID] [int] NULL,
[DB_FILE_TYPE] [varchar](max) NULL,
[DISK] [varchar](max) NULL,
[FILE_LOCATION] [varchar](max) NULL,
[TIMESTAMP] [datetime] NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
*/
--Capture IO information from DMV and query to find deltas over time.
/*
USE [SysDBA]
GO
INSERT INTO [dbo].[DISKIOPS]
([IO_STALL]
,[IO_STALL_READ_MS]
,[IO_STALL_WRITE_MS]
,[NUM_OF_READS]
,[NUM_OF_WRITES]
,[SIZE_ON_DISK_MB]
,[DBNAME]
,[NAME]
,[FILE_ID]
,[DB_FILE_TYPE]
,[DISK]
,[FILE_LOCATION]
,[TIMESTAMP])
SELECT a.io_stall, a.io_stall_read_ms, a.io_stall_write_ms, a.num_of_reads,
a.num_of_writes,
--a.sample_ms, a.num_of_bytes_read, a.num_of_bytes_written,
( ( a.size_on_disk_bytes / 1024 ) / 1024.0 ) AS size_on_disk_mb,
db_name(a.database_id) AS dbname,
b.name, a.file_id,
db_file_type = CASE
WHEN a.file_id = 2 THEN 'Log'
ELSE 'Data'
END,
UPPER(SUBSTRING(b.physical_name, 1, 2)) AS disk_location,
b.physical_name AS File_location,
GETDATE() AS Timestamp
FROM sys.dm_io_virtual_file_stats (NULL, NULL) a
JOIN sys.master_files b ON a.file_id = b.file_id
AND a.database_id = b.database_id
GO
*/
DECLARE @File_Name VARCHAR(8000),
@Disk VARCHAR(5)
SET @File_Name = 'DBTEST'
SET @Disk = 'I:'
--Code to pull out deltas between collected IO stats.
;WITH IOPS ([IO_STALL]
,[IO_STALL_READ_MS]
,[IO_STALL_WRITE_MS]
,[NUM_OF_READS]
,[NUM_OF_WRITES]
,[SIZE_ON_DISK_MB]
,[DBNAME]
,[NAME]
,[FILE_ID]
,[DB_FILE_TYPE]
,[DISK]
,[FILE_LOCATION]
,[TIMESTAMP]
,[ROW])
AS
(
SELECT *, ROW_NUMBER() OVER (PARTITION BY FILE_LOCATION ORDER BY TIMESTAMP DESC) AS [ROW]
FROM dbo.DISKIOPS
)
SELECT MAX([IO2].[IO_STALL] - [IO1].[IO_STALL])
FROM IOPS IO1 JOIN IOPS IO2 ON IO1.ROW = (IO2.ROW+1)
WHERE IO1.NAME = IO2.NAME
AND IO1.Disk = @Disk
嗨,我已经添加了代码,我在将其格式化时遇到了一些麻烦,所以我希望它可以。
—
汤姆(Tom)
io_stall
本身并不意味着太多。如果在10秒内您有1000次操作停顿1秒,那么您将有1000秒停顿。那将是10秒内16分钟以上的停顿。您需要将此与IO操作相关联。您可以在问题中发布实际查询吗?