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。
