Querying Extended Events in SQL Server 2008
-
16-10-2019 - |
Question
I have created the following event session using a script I got from Kimberly Tripp's SQL Server 2008 Internals book. It has been modified to send to a file instead of the ring buffer.
CREATE EVENT SESSION
[statement_completed_file]
ON SERVER
ADD EVENT
sqlserver.sp_statement_completed,
ADD EVENT
sqlserver.sql_statement_completed
(
ACTION
(
sqlserver.sql_text
)
WHERE
(
sqlserver.session_id=53
)
)
ADD TARGET package0.asynchronous_file_target
(
set filename=N'C:\MSSQL\TEMP\stats.xel',
metadatafile=N'C:\MSSQL\TEMP\stats.xem'
)
WITH
(
MAX_MEMORY=4096KB,
EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,
MAX_DISPATCH_LATENCY=1 SECONDS,
TRACK_CAUSALITY=OFF,
STARTUP_STATE=OFF
)
Here is the original script to query the data.
SELECT
theNodes.event_data.value('(data/value)[1]', 'bigint') AS source_database_id,
theNodes.event_data.value('(data/value)[2]', 'bigint') AS object_id,
theNodes.event_data.value('(data/value)[3]', 'bigint') AS object_type,
theNodes.event_data.value('(data/value)[4]', 'bigint') AS cpu,
theNodes.event_data.value('(data/value)[5]', 'bigint') AS duration,
theNodes.event_data.value('(data/value)[6]', 'bigint') AS reads,
theNodes.event_data.value('(data/value)[7]', 'bigint') AS writes,
theNodes.event_data.value('(action/value)[1]', 'nvarchar(max)') AS sql_text
FROM
(
SELECT
CONVERT(XML, st.target_data) AS ring_buffer
FROM sys.dm_xe_sessions s
JOIN sys.dm_xe_session_targets st ON s.address = st.event_session_address
WHERE s.name = 'statement_completed'
) AS theData
CROSS APPLY
theData.ring_buffer.nodes('//RingBufferTarget/event') theNodes (event_data)
WHERE theNodes.event_data.value('(action/value)[1]', 'nvarchar(max)') is not null
How could I modify it to read from the two files xel and xem instead of the ring buffer. I have been googling around but the learning curve has been rough. Thank you in advance for your help.
Solution
Try to play with this example:
CREATE EVENT SESSION
[statement_completed_file]
ON SERVER
ADD EVENT
sqlserver.sp_statement_completed,
ADD EVENT
sqlserver.sql_statement_completed
(
ACTION
(
sqlserver.sql_text
)
WHERE
(
sqlserver.session_id <> 53
)
)
ADD TARGET package0.asynchronous_file_target
(
set filename=N'C:\stats.xel',
metadatafile=N'C:\stats.xem'
)
WITH
(
MAX_MEMORY=4096KB,
EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,
MAX_DISPATCH_LATENCY=1 SECONDS,
TRACK_CAUSALITY=OFF,
STARTUP_STATE=OFF
)
GO
ALTER EVENT SESSION [statement_completed_file]
ON SERVER
STATE=START
GO
SELECT event_data,
event_data.value('(event/@name)[1]', 'varchar(50)') AS event_name,
event_data.value('(event/data/value)[1]', 'bigint') AS source_database_id,
event_data.value('(event/data/value)[2]', 'bigint') AS object_id,
event_data.value('(event/data/value)[3]', 'bigint') AS object_type,
event_data.value('(event/data/value)[4]', 'bigint') AS cpu,
event_data.value('(event/data/value)[5]', 'bigint') AS duration,
event_data.value('(event/data/value)[6]', 'bigint') AS reads,
event_data.value('(event/data/value)[7]', 'bigint') AS writes,
event_data.value('(event/action/value)[1]', 'nvarchar(max)') AS sql_text
FROM
(
SELECT CAST(event_data AS XML) AS event_data
FROM sys.fn_xe_file_target_read_file('C:\stats*.xel', 'C:\stats*.xem', null, null)
) tbl
GO
DROP EVENT SESSION [statement_completed_file] ON SERVER
GO
OTHER TIPS
Heres another query
declare
xmlData xml;
select
@xmlData = [xet].[event_data]
from
[sys].fn_xe_file_target_read_file('C:\stats*.xel', 'C:\stats*.xem', null, null) as [xet];
with cte_xmlData as (
select
[e].value('@name', 'nvarchar(max)') as [EventName],
[e].value('@timestamp', 'datetime') as [EventTimeStamp],
[d].value('value[1]', 'nvarchar(max)') as [DdlPhase],
[d].value('text[1]', 'nvarchar(max)') as [DdlPhaseDesc],
[c].value('@name', 'nvarchar(max)') as [Name],
[c].value('value[1]', 'nvarchar(max)') as [Value]
from
@xmlData.nodes('/RingBufferTarget/event') as [xml]([e])
inner join @xmlData.nodes('/RingBufferTarget/event/action') as [xml2]([c])
on ( [c].value('../@timestamp', 'datetime') = [e].value('@timestamp', 'datetime') )
inner join @xmlData.nodes('/RingBufferTarget/event/data') as [xml3]([d])
on ( [d].value('../@timestamp', 'datetime') = [e].value('@timestamp', 'datetime') )
and ( [d].value('@name', 'nvarchar(max)') = 'ddl_phase' )
union
select
[e].value('@name', 'nvarchar(max)') as [EventName],
[e].value('@timestamp', 'datetime') as [EventTimeStamp],
[d].value('value[1]', 'nvarchar(max)') as [DdlPhase],
[d].value('text[1]', 'nvarchar(max)') as [DdlPhaseDesc],
[c].value('@name', 'nvarchar(max)') as [Name],
case
when [c].exist('text[1]') = 0 then [c].value('value[1]', 'nvarchar(max)')
else [c].value('text[1]', 'nvarchar(max)')
end as [Value]
from
@xmlData.nodes('/RingBufferTarget/event') as [xml]([e])
inner join @xmlData.nodes('/RingBufferTarget/event/data') as [xml2]([c])
on ( [c].value('../@timestamp', 'datetime') = [e].value('@timestamp', 'datetime') )
inner join @xmlData.nodes('/RingBufferTarget/event/data') as [xml3]([d])
on ( [d].value('../@timestamp', 'datetime') = [e].value('@timestamp', 'datetime') )
and ( [d].value('@name', 'nvarchar(max)') = 'ddl_phase' )
)
/**/
select
[pData].[EventName],
[pData].[EventTimeStamp],
[pData].[DdlPhaseDesc],
[pData].[event_name],
[pData].[source_database_id],
[pData].[object_id],
[pData].[object_type],
[pData].[cpu],
[pData].[duration],
[pData].[reads],
[pData].[writes],
[pData].[sql_text]
from
[cte_xmlData]
-- Modify the in statement depending on what you want
pivot(max([value]) for [name] in ([event_name], [source_database_id], [object_id], [object_type], [cpu], [duration], [reads], [writes], [sql_text])) as [pData]
order by
[EventTimeStamp],
[DdlPhase];
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