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Actual combat: sqlserver 2008 Extended event XML is converted to standard table format [easy to understand]
2022-07-07 21:20:00 【Full stack programmer webmaster】
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-- The hypothesis already exists Event Session Delete
IF EXISTS (SELECT * FROM sys.server_event_sessions WHERE name='MonitorLongQuery')
DROP EVENT SESSION MonitorLongQuery ON SERVER
GO
-- establish Extended Event session
CREATE EVENT SESSION MonitorLongQuery ON SERVER
-- add to Event(SQL Completion event )
ADD EVENT sqlserver.sql_statement_completed
(
-- Specify collected Event Information
ACTION
(
sqlserver.database_id,
sqlserver.session_id,
sqlserver.username,
sqlserver.client_hostname,
sqlserver.sql_text,
sqlserver.tsql_stack
)
--Filter Information (CPU Exceed or the whole execution time exceeds 10S)
WHERE sqlserver.sql_statement_completed.cpu> 10000
OR sqlserver.sql_statement_completed.duration> 10000
)
-- Specify collected Event Information storage location ( It can be stored in memory or in files )
ADD TARGET package0.asynchronous_file_target
(
SET FILENAME = N's:\monitor\LogQuery.xet',
METADATAFILE = 'S:\monitor\LongQuery.xem'
)
GO
SELECT sessions.name AS SessionName,sevents.package as PackageName,
sevents.name AS EventName,
sevents.predicate, sactions.name AS ActionName, stargets.name AS TargetName
FROM sys.server_event_sessions sessions
INNER JOIN sys.server_event_session_events sevents
ON sessions.event_session_id= sevents.event_session_id
INNER JOIN sys.server_event_session_actions sactions
ON sessions.event_session_id= sactions.event_session_id
INNER JOIN sys.server_event_session_targets stargets
ON sessions.event_session_id= stargets.event_session_id
WHERE sessions.name='MonitorLongQuery'
GO
-- start-up Event Session Capture data
ALTER EVENT SESSION MonitorLongQuery
ON SERVER STATE = START
GO
-- Inquire about
SELECT CAST(event_data AS XML) event_data,*
FROM sys.fn_xe_file_target_read_file
('s:\monitor\LogQuery_0_129954478780290000.xet',
's:\monitor\LongQuery_0_129954478780330000.xem',NULL,NULL)
go
- Stop Event Session
ALTER EVENT SESSION MonitorLongQuery
ON SERVER STATE = STOP
GO
-- Delete Event Session
IF EXISTS(SELECT * FROM sys.server_event_sessions WHERE name='MonitorLongQuery')
DROP EVENT SESSION MonitorLongQuery ON SERVER
GO
------------ take XML Convert to regular table format
IF EXISTS ( SELECT *
FROM tempdb.dbo.sysobjects
WHERE id = OBJECT_ID(N'tempdb..#MyData')
AND type = 'U' )
DROP TABLE #MyData
go
CREATE TABLE #MyData
(
database_id INT NOT NULL ,
username NVARCHAR(100) NOT NULL,
client_hostname NVARCHAR(100) NOT NULL,
sql_text NVARCHAR(MAX) NOT NULL ,
cpu INT NOT NULL
)
go
DECLARE @xmlData XML
DECLARE @xmlString NVARCHAR(MAX)
DECLARE @database_id INT
DECLARE @username NVARCHAR(100)
DECLARE @client_hostname NVARCHAR(100)
DECLARE @sql_text NVARCHAR(MAX)
DECLARE @cpu INT
DECLARE myCur CURSOR READ_ONLY
FOR
SELECT TOP 200 event_data --CAST(event_data AS XML)
FROM sys.fn_xe_file_target_read_file
('s:\monitor\LogQuery_0_130638808366940000.xet',
's:\monitor\LongQuery_0_130638808366940000.xem',NULL,NULL)
OPEN myCur
FETCH NEXT FROM myCur INTO @xmlString
WHILE @@FETCH_STATUS = 0
BEGIN
BEGIN TRY
SET @xmlData = CAST(@xmlString AS XML)
--set @cpu = 0
-- obtain cpu
SET @cpu = @xmlData.query('//data[@name="cpu"]/value').value('(value)[1]',
'INT')
-- obtain database_id
SET @database_id = @xmlData.query('//action[@name="database_id"]/value').value('(value)[1]',
'INT')
-- obtain username
SET @username = @xmlData.query('//action[@name="username"]/value').value('(value)[1]',
'NVARCHAR(100)')
-- obtain hostname
SET @client_hostname = @xmlData.query('//action[@name="client_hostname"]/value').value('(value)[1]',
'NVARCHAR(100)')
-- obtain sql_text
SET @sql_text = @xmlData.query('//action[@name="sql_text"]/value').value('(value)[1]',
'NVARCHAR(MAX)')
-- Start inserting data
INSERT #MyData
( database_id,
sql_text,
username,
client_hostname,
cpu )
VALUES ( @database_id, -- database_id - int
@sql_text, -- sql_text - nvarchar(max)
@username,
@client_hostname,
@cpu
)
END TRY
BEGIN CATCH
END CATCH
FETCH NEXT FROM myCur INTO @xmlString
END
CLOSE myCur
DEALLOCATE myCur
SELECT b.name,a.username,a.client_hostname,a.sql_text,a.cpu FROM #MyData AS a
inner join sys.databases as b
on a.database_id=b.database_id
order by a.cpu desc
go
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