XEvent – SQL Server Log文件对磁盘的写操作大小是多少

原文: XEvent – SQL Server Log文件对磁盘的写操作大小是多少

本篇是上一篇SQL Server Log文件对磁盘的写操作大小是多少的续，使用XEvent收集SQL Server Data文件和Log文件的写大小，脚本如下：

DECLARE @DBNAME VARCHAR(256)

SET @DBNAME = 'myDB'

DECLARE @sqlcmd NVARCHAR(MAX) = 'IF EXISTS(SELECT * FROM sys.server_event_sessions WHERE

name=''filewritecompleted'')

   DROP EVENT SESSION [filewritecompleted] ON SERVER;

CREATE EVENT SESSION [filewritecompleted]

ON SERVER

ADD EVENT sqlserver.file_write_completed 

(WHERE (database_id = ' + CAST(DB_ID(''+@DBNAME+'') AS VARCHAR(3))

    + '))

ADD TARGET package0.asynchronous_file_target(

     SET filename=''D:\XEvent\filewritecompleted.xel'',

         metadatafile=''D:\XEvent\filewritecompleted.xem'')

WITH (MAX_MEMORY = 8192KB, EVENT_RETENTION_MODE = ALLOW_SINGLE_EVENT_LOSS, STARTUP_STATE = ON)'

EXEC(@sqlcmd)

GO

 

ALTER EVENT SESSION filewritecompleted

ON SERVER

STATE=START

GO

 

WAITFOR DELAY '00:05:00'

 

ALTER EVENT SESSION filewritecompleted

ON SERVER

STATE=STOP

GO

 

USE tempdb

GO

 

SELECT  CAST(event_data AS XML) AS event_data

INTO    TargetEvents

FROM    sys.fn_xe_file_target_read_file('D:\XEvent\filewritecompleted*.xel',

                                        'D:\XEvent\filewritecompleted*.xem', NULL,

                                        NULL)

 

SELECT  event_data.value('(event/@name)[1]', 'varchar(50)') AS event_name ,

        DATEADD(hh, DATEDIFF(hh, GETUTCDATE(), CURRENT_TIMESTAMP),

                event_data.value('(event/@timestamp)[1]', 'datetime2')) AS [timestamp] ,

        COALESCE(event_data.value('(event/data[@name="database_id"]/value)[1]',

                                  'int'),

                 event_data.value('(event/action[@name="database_id"]/value)[1]',

                                  'int')) AS database_id ,

        event_data.value('(event/data[@name="mode"]/text)[1]',

                         'nvarchar(4000)') AS [mode] ,

        event_data.value('(event/data[@name="file_handle"]/value)[1]',

                         'nvarchar(4000)') AS [file_handle] ,

        event_data.value('(event/data[@name="offset"]/value)[1]', 'bigint') AS [offset] ,

        event_data.value('(event/data[@name="file_id"]/value)[1]', 'int') AS [file_id] ,

        event_data.value('(event/data[@name="filegroup_id"]/value)[1]', 'int') AS [filegroup_id] ,

        event_data.value('(event/data[@name="size"]/value)[1]', 'bigint') AS [size]

INTO    Results

FROM    TargetEvents

 

select * from Results

 

 

--Log File Write Size

SELECT  size ,

        COUNT(*) AS cnt ,

        LTRIM(CAST(COUNT(*) * 1.0 / ( SELECT    COUNT(*)

                                      FROM      Results

                                      WHERE     file_id = 2

                                    ) * 100 AS NUMERIC(18, 4))) + '%' AS ratio

FROM    Results

WHERE   file_id = 2

GROUP BY size

ORDER BY CAST(COUNT(*) * 1.0 / ( SELECT    COUNT(*)

                                      FROM      Results

                                      WHERE     file_id = 2

                                    ) * 100 AS NUMERIC(18, 4)) desc

 

 

--Data File Write Size

SELECT  size ,

        COUNT(*) AS cnt ,

        LTRIM(CAST(COUNT(*) * 1.0 / ( SELECT    COUNT(*)

                                      FROM      Results

                                      WHERE     file_id != 2

                                    ) * 100 AS NUMERIC(18, 4))) + '%' AS ratio

FROM    Results

WHERE   file_id != 2

GROUP BY size

ORDER BY CAST(COUNT(*) * 1.0 / ( SELECT    COUNT(*)

                                      FROM      Results

                                      WHERE     file_id = 2

                                    ) * 100 AS NUMERIC(18, 4)) desc

 

--DROP TABLE tempdb.dbo.TargetEvents, tempdb.dbo.Results

　　

在一个OLTP结果如下：

Log File Write Size：

Data File Write Size ：

 

用XEvent收集，的确要比之前的方法简单很多，此方法感谢一位Cookies_Tang网友提醒。