SQL 2012 :: Capturing Historic Deadlock Using Extended Event
Dec 9, 2014
I am learning Extended event to capture deadlock which already happened, for this in my SQL SERVER 2012.. I am simulating a deadlock . With [URL]... where given a query to find the deadlock details using extended event here is the code..Retrieve from Extended Events in 2012.
SELECT XEvent.query('(event/data/value/deadlock)[1]') AS DeadlockGraph
FROM ( SELECT XEvent.query('.') AS XEvent
FROM ( SELECT CAST(target_data AS XML) AS TargetData
FROM sys.dm_xe_session_targets st
JOIN sys.dm_xe_sessions s
[code]...
This code creates a deadlock but when i run the above Extended events query to get the details of deadlock, it doesnot display any results.
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Oct 24, 2015
We know we can use the event lock_deadlock and xml_deadlock_report to capture the deadlock info, however I also want to capture the execution plans for all of the SPIDs in the deadlock graph, how to output the execution plans to the extended events trace results either ? such as if there is an action for execution plan or workaround for it ?If there is no built in action for execution plan , may I know if we can add the customized info to the extended events results file also ? Such as when the deadlock related event happens , then we can run a query to get some info ,then added the info along with other info such as sql_text, dbname etc to the events trace results file either ? The reason is if we also know the execution plans when the deadlock happens, it is useful to turning the query based on the execution plans to reduce deadlock happening .
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Jun 17, 2014
I have an existing EE setup that captures all failing queries (see code below). The problem is that I also want to somehow capture RPC_starting so that I can see which parameters are passed in whenever a query fails. Is there a way to somehow capture those two events (error_reported & rpc_starting), but only capture rpc_starting when there is actually an error reported?Or maybe just an event on rpc_starting and somehow filter to only capture when there is an error?
Existing error_reported EE code:
CREATE EVENT SESSION [what_queries_are_failing] ON SERVER ADD EVENT sqlserver.error_reported (
ACTION(sqlserver.sql_text, sqlserver.tsql_stack, sqlserver.database_id, sqlserver.session_id,
package0.collect_system_time, sqlserver.transaction_id, sqlserver.username, sqlserver.client_hostname)
[code]....
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Jan 27, 2015
I do have the following Extended Event session on my Dev box;
CREATE EVENT SESSION [sp_showplan] ON SERVER
ADD EVENT sqlserver.query_post_execution_showplan(SET collect_database_name=(1)
ACTION(sqlserver.plan_handle)
WHERE ([package0].[equal_uint64]([object_type],(8272)) AND [sqlserver].[equal_i_sql_unicode_string]([object_name],N'MyStoreProcedure')))
ADD TARGET package0.event_file(SET filename=N'E:DBA_AuditSP_Exec.xel',metadatafile=N'E:DBA_AuditSP_Exec.xem')
WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=OFF)
GO
The idea is being able to capture the execution plan when the program invokes the store procedure, regardless of the database.
This works on my Dev box. When I manually trigger "MyStoreProcedure" from database A , the event is saved. The same thing happens when I do that from database B. Ok ... so far, so good.
So I went to the live production environment and setup my Extended Events session. But it's saving nothing. I was able to check that the store procedure was executed on several databases but my extended events session never grabbed the plan.
What could be the reason for this? Memory starvation maybe? Is there something I am doing wrong?
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Oct 6, 2014
I've setup a deadlock monitor using extended events like this.
CREATE EVENT SESSION [deadlock] ON SERVER
ADD EVENT sqlserver.lock_deadlock(
ACTION(package0.process_id,sqlserver.client_app_name,sqlserver.client_hostname,
sqlserver.database_id,sqlserver.database_name,sqlserver.plan_handle)
[Code] ....
Deadlock happened couple of days ago. I'm trying to determine the cause of deadlocks. What script should I use to pull that information to see what objects/processes caused deadlock?
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Nov 1, 2015
We have (running SQL 2012 Std) and have enabled trace flag 1204 and 1222 for capturing deadlock through extended events. I have enabled deadlock notification through email .But it only send deadlock event occurred notification from the sql server error log . I was wondering if its possible to email the deadlock details they get generated in extended events via DB mail.
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Feb 25, 2014
I am trying to use xquery to get event data back from extended events. I am trying to use some sample data from Grant Fritchey but I am getting null records back. Below is the xml - I just want to retrieve a distinct list of the client_hostname and client_app_name.
<event name="login" package="sqlserver" timestamp="2014-02-19T23:53:54.299Z">
<data name="is_cached"><value>true</value></data><data name="is_dac">
<value>false</value></data><data name="database_id"><value>7</value>
</data><data name="packet_size"><value>8000</value></data><data name="options">
[Code] ....
The query I have that doesn't work is :
WITH xEvents AS
(SELECT object_name AS xEventName,
CAST (event_data AS xml) AS xEventData
FROM sys.fn_xe_file_target_read_file
('C:LoginTraceShared_0*.xel', NULL, NULL, NULL))
SELECT distinct top 1000 xEventName,
xEventData.value('(/event/data[@action_name=''Client_APP_Name'']/value)[1]','varchar') Client_APP_Name,
xEventData.value('(/event/data[@action_name=''Client_Host_Name'']/value)[1]','varchar') Client_Host_Name
FROM xEvents
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Jun 2, 2015
Recently we migrated our environment to 2012.
We are planning to implement Xevents in all the servers in place of Trace files and everything is working fine.
Is it possible to configure Extended event to trigger a mail whenever any event (example dead lock) occurs.
I have gone through so many websites but i never find.
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Jan 25, 2012
I have two extended events sessions running on a server. I do have sql jobs that automatically stop the XE sessions and import the results to working tables. I see two "ALTER EVENT SESSION XXXX ON SERVER STATE = STOP" statements that are being executed for more than 2 days, the wait types are XE_SERVICES_MUTEX and PREEMPTIVE_XE_SESSIONCOMMIT. This is not the first time I see this behavior.I do not want to kill the sessions (I guess the sessions won't die anyway) neither restart the sql service
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Jan 14, 2015
I want to gather (and filter by) client ip address in an extended events session. So far, I have the sqlserver.login event added, but I can find no way to get client ip address added to the action or predicate.
I can filter by the pred_source field "session_nt_domain" or "nt_domain" but this is not always populated by all logins and also, this domain only lists machine name, such as FRED, as opposed to the full domain FRED.foo.bar.
Is it possible to gather login client ip address in an extended events session? Surely internal SQL Server processes have access to it because the login audit can populate client ip address.
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Jan 15, 2015
I am logging into a SQL instance to run the following query:
DECLARE @ReturnCode int EXECUTE @ReturnCode = [master].dbo.xp_create_subdir N'sharemasterFULL' IF @ReturnCode <> 0 RAISERROR('Error creating directory.', 16, 1)
The share in which the folder is to be created has my account added with full permissions to create files. However this command fails unless I add the SQL Service account user with rights to the folder also.
Is this expected behaviour, is this something specific to extended stored procedures?
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Apr 15, 2015
When you view the Extended Events "Watch Live Data" is the duration in milliseconds or microseconds? I'm assuming it's milliseconds, but if you look at the timestamp difference from start to complete it doesn't add up to the duration amount? It looks like it's just the difference between the timestamps?
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Jun 4, 2015
I use this code in a utility procedure (for performance testing) but it is really slow.
For example, a session with three events is taking 5 seconds to complete this query:
DECLARE @xml xml=
(
SELECT CAST(xet.target_data AS xml)
FROM sys.dm_xe_session_targets AS xet
JOIN sys.dm_xe_sessions AS xe
ON (xe.address = xet.event_session_address)
WHERE xe.name = @name
);
with data as
(
select
convert(varchar(128),convert(varbinary(128),'0x'+n.value('(action[@name="context_info"]/value/text())[1]','varchar(128)'),1)) context
, n.value('(data[@name="duration"]/value/text())[1]','int')/1000.0 duration
, n.value('(data[@name="cpu_time"]/value/text())[1]','bigint')/1000.0 cpu_time
, n.value('(data[@name="physical_reads"]/value/text())[1]','bigint') physical_reads
[code].....
So, I was wondering (considering the buffer is usually only holding a few hundred events)
1. Is this the wrong way to query data from a ring buffer?
2. Is there any way to make this code quicker?
3. Is it better to target a file store rather than a ring buffer for this?
select geometry::STGeomFromWKB(0x0106000000020000000103000000010000000B0000001000000000000840000000000000003D
D8CCCCCCCCCC0840000000000000003DD8CCCCCCCCCC08408014AE47E17AFC3F040000000000104000
[Code] .....
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Sep 9, 2014
I have enabled 1222 and 1204 trace and restarted sql server. then i have replicated deadlock in my local.
This is the error came in sql
Msg 1205, Level 13, State 45, Line 1
Transaction (Process ID 51) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
Then i opened ERRORLOG file , there is no information about deadlocks .
Where can found deadlock information and file path. is there any extra options required to enable trace?
DBCC TRACESTATUS(1222,-1)
TraceFlagStatusGlobalSession
1222110
How to find location trace log?
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Sep 10, 2014
I am getting deadlock in my production, i was taken deadlock information from trace file , i found deadlock graph but i am unable to find exact scenario . I am attaching deadlock trace file.
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May 18, 2015
I have a weekly Maintenance Plan Reindex job that has failed because of a deadlock. My question seems simple enough and I'm ashamed to say I ought to know this answer, but here goes: Does the rest of a given job continue after such failures (this one was maybe 3/4 through the log) occur?
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Apr 21, 2014
I am using SQL Server 2012 and to me a part of data captured by CDC is not making sense.
I have a table called 'Schema.Table1', and I enabled CDC on it by running 'sys.sp_cdc_enable_table'. I see that a table called 'cdc.Schema_Table1_CT' got created which now gets an entry when ever I Insert, Update or delete a record in the original table.
Till this point every thing works fine.
My original Table has a NOT NULL INT column called 'AuditTrackerUserID' with a default value of 1996. My application does not provides a value for this column, but because the column itself has a default value, records get inserted without error.
When I try to execute the following Query I see multiple records with __$operation of 3 and 1.
SELECT * from cdc.Schema_Table1_CT where AuditTrackerUserID IS NULL
My expectation is that I should not ever see any record returned by this query because AuditTrackerUserID is a not null column, but I do.
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Oct 14, 2014
In the past, I've combined server side traces with Perfmon successfully, which is pretty useful, I know that. I would like to do the same with Extended Events, so I can correlate and analyze the server side as well.
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Mar 4, 2015
I wanted to demonstrate something about CXPACKET wait type. For the purpose of this demo I've created a query in AdventureWorks database that uses a parallel query plan, an extended events session that captured the wait statistics for a single session and a query that shows the extended event's data. I ran it and it worked fine. Then I dropped and recreated the event session (to clear the data), in a new window I wrote a transaction that updated the table fallowed by waitfor statement so the first query will be blocked for few seconds and ran the whole thing again. The select statement was blocked as expected (ran for 9 seconds instead on 1 second as it ran without the blocking), but the wait stats that I got were almost identical to the those that I got without blocking the query.
--Query that uses parallel query plan
With MyCTE as (
select top 50 * from Sales.SalesOrderHeader)
select top 10000 * from Sales.SalesOrderHeader, MyCTE
order by newid()
[code]....
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Mar 13, 2015
In order to troubleshoot some deadlocking that I am seeing on SQL Server, I am trying to capture the Deadlock XML by enabling the Events Extraction Settings option 'Save Deadlock XML events separately' and specifying a Deadlock XML results file.
Meanwhile, I am also tracing the Deadlock graph, Lock:Deadlock, and Lock:Deadlock Chain events. Yet the xdl file remains empty even though I am getting hits on the events themselves in the SQL Profiler trace.
Also, I have the following trace flag settings enabled.
TraceFlagStatusGlobalSession
1204110
1222110
Why the xdl file remains empty even though (I think) it should contain some XML for deadlocks that are actually happening?
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Nov 3, 2015
I am getting a number of deadlocks when inserting and deleting items from the same table.
The delete statement has a U lock and awaiting an IX lock on an index that covers the column in the where clause.
The insert statement has a IX lock and awaiting a U lock on the same index.
The delete statement is deleting about 5000 rows, where as the insert statement is inserting a single row.
Both these statements are found in stored procedures being called from LINQ to SQL.
I am wondering if there is a way I can prevent the delete statement taking the U lock out?My thinking being if the delete didn't take out the U lock then it would not deadlock with the insert. Are there any hints I could use to avoid the particular lock above?
I have seen various examples of multiple updates causing a deadlock, which can be fixed by adding multiple indexes. However, as I am inserting and deleting rows I imagine that all the indexes will need to be updated by both operations.
I have inherited the architecture and don't have the time to redesign everything at present. My backup plan is to deprioritize the delete and build in a retry mechanism.
However, it would be really good if I could find a more elegant way to handle deleting and inserting rows at the same time.
Deadlock trace information below...
11/02/2015 22:21:26,spid21s,Unknown,waiter id=process1cc9c68558 mode=IX requestType=wait
11/02/2015 22:21:26,spid21s,Unknown,waiter-list
11/02/2015 22:21:26,spid21s,Unknown,owner id=process203f31b498 mode=U
11/02/2015 22:21:26,spid21s,Unknown,owner-list
11/02/2015 22:21:26,spid21s,Unknown,pagelock fileid=1 pageid=721673 dbid=6 subresource=FULL objectname=PerforceReports_Staging.dbo.DebugReport id=lock1663f5d900 mode=U
[Code] ....
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Aug 31, 2015
We have around 5 SP’s which are inserting data into Table A,and these will run in parallel.From the temp tables in the SP,data will be loaded to Table A. We are getting deadlock here.No Begin and End Transaction used in the stored procedure.
What could be done to avoid deadlock.
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Oct 22, 2015
I have a deadlock trace running on a production server that is filling up with the following:
Lock: Deadlock Chain
Parallel query worker thread was involved in a deadlock SPID 8
105 - Resource Type Exchange
Spid 8 is a SQL process LOCK MONITOR
There are no graphs as seen with typical deadlock, so it is not two queries that are deadlocking, and I've never seen a deadlock for "LOCK MONITOR"
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May 27, 2015
We are planning to convert or change all existing Traces to Extended Events in SQL server 2012. What is the procedure to convert custom traces. We have already created some below custom traces: like this we are planning to convert for all servers.
exec sp_trace_setevent @TraceID, 20, 23, @on
exec sp_trace_setevent @TraceID, 20, 8, @on
exec sp_trace_setevent @TraceID, 20, 12, @on
exec sp_trace_setevent @TraceID, 20, 64, @on
exec sp_trace_setevent @TraceID, 20, 1, @on
exec sp_trace_setevent @TraceID, 20, 21, @on
[code]...
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Sep 15, 2015
I am trying to implement Slowly Changing dimension transformation using Merge.Meaning both changing and historic attribute is in place. It seems we can use Update only once in Merge, in our scenario we have to update...When the historic attribute also have changed (To update the row as expired, IsCurrent=0)Also When changing attribute is changed. (Historic attribute is same). This case also we need to use Update. I am using CDC to do this. Updated OUTPUT is moving to a temporary table and using Execute SQL task to get updated.
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Mar 30, 2015
I set up a trigger to capture logins at the server level. This is part of some metrics I am putting together to properly set up load testing.
I am not surprised by the number of logins from the application logins, but what does surprise me is the number of logins from the various users that can query the production data.
As an example, my account has 1200+ logins for today only.
My first thought was that a process was set up to use my login by mistake. This also applies to some of the other users.But, there are no processes that are using any login except for the SQL service account or the applications logins.
What constitutes a login event?
[URL]
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Nov 28, 2014
I created a Blocking Event Notification following this article ->[URL=
How do I throttle the alerts so that I only receive one alert per hour instead of 1000?
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Nov 10, 2015
Is there a way to send out an email woth deadlock information (victim query, winner query, process id's and resources on which the deadlock occurred) as soon as a deadlock occurs in a database or at instance level?I currently has trace flag 1222 turned on. And also created an alert that send me an email whenever a deadlock occurs. but it just says that a deadlock occurred and I log into sql server error log and review the information.
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Jan 27, 2015
For Bulk Load requests in SQL server, Are there any specific profiler event? Like the one we have for RPC RPC:Starting and for Batch Requests, we have SQL:BatchStarting.
Are Bulk Load requests that are being monitored through Profiler captured as SQL:Batch... events at the backend?
Are there any new features added in 2012 or 2014 to identify a Bulk request submitted through bcp.exe utility or any other sqlbulkcopy program?
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Jan 21, 2015
Got following query:
SELECT
event_data.value('(event/data/value)[4]', 'bigint') AS cpu_time,
--database name
event_data.value('(event/data/value)[5]', 'bigint') AS duration,
--estimated cost
--estimated rows
--nest level
[code]...
Basically, is a simple T-SQL query that reads the local file for my already setup extended event sessions. But I can't find the way to retrieve the following attributes as part as the T-SQL query:
--database name
--estimated cost
--estimated rows
--nest level
--object name
I am trying to find a BOL or some MS link with the full list of possible values for event_data.value but can't find one.
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Jan 27, 2015
After monitoring using SQL profiler, i found that Missing join predicate event is happening a lot.
The problem is that profiler doesn't allow me to select the textdata to know which SQL statement is causing the issue.
I tried using the spid to check what's that process is running but the problem is that application is running many sqls so when i run
select PROGRAM_NAME,hostname,qt.text from sys.sysprocesses as sps1 CROSS APPLY sys.dm_exec_sql_text(sps1.sql_handle) AS qt
where spid=169
it gets me the SQL being run at that time not the one that causing the event.
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May 15, 2008
i have created the folowing function but keep geting an error.
Only functions and extended stored procedures can be executed from within a function.
Why am i getting this error!
Create Function myDateAdd
(@buildd nvarchar(4), @avdate as nvarchar(25))
Returns nvarchar(25)
as
Begin
declare @ret nvarchar(25)
declare @sqlval as nvarchar(3000)
set @sqlval = 'select ''@ret'' = max(realday) from (
select top '+ @buildd +' realday from v_caltable where realday >= '''+ @avdate +''' and prod = 1 )a'
execute sp_executesql @sqlval
return @ret
end
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Oct 25, 2011
My SQL Server 2005 SP4 on Windows 2008 R2 is flooded with the below errors:-
Date 10/25/2011 10:55:46 AM
Log SQL Server (Current - 10/25/2011 10:55:00 AM)
Source spid
Message
Event Tracing for Windows failed to send an event. Send failures with the same error code may not be reported in the future. Error ID: 0, Event class ID: 54, Cause: (null).
Is there a way I can trace it how it is coming? When I check input buffer for these ids, it looks like it is tracing everything. All the general application DMLs are coming in these spids.
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