SQL 2012 :: Deadlock XDL File Remains Empty Even During Deadlocks
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?
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.
Why shrinkfile empty file does not redistribute data evenly in the primary file group with multiple files:
Please run the script attached to see what the end result is.
This is what I set up last night on my test machine.
1) Create database [FGTest] size 200MB 2) Create table called TEST on primary 3) Insert 40MB of data into test 4) Create another file group called temp in primary size 200MB 5) Shrinkfile('FGTest',emptyfile) so that all data is transfered from FGTest into temp file group. 6) Add another 2 files called DATA2 and DATA3. Both are 200MB. 7) We now have 3 empty files that I want data distributed evenly on. FGTest, DATA2 & DATA3 8) Shrinkfile('temp',emptyfile) to move all the data from temp over the 3 file groups evenly
I would expect at this stage to have the following:
FGTest = 13MB, DATA2 = 13MB, DATA3 = 13MB
(40MB of data over 3 files should be about 13 MBish in each file)
What I actually end up with is this:
FGTest = 20MB DATA1 = 10MB DATA2 = 10MB
It looks as though SQL Server is allocating 50% of all data to the original file and then 50% evenly over the remaining files in PRIMARY.
I have an SQL Job whose sole step is to run an SSIS Package via the File System mode. The .dtsx file itself is located on the server where SQL resides.
The SSIS task looks inside a specific directory and if a qualifying file exists, archives the file, unzips the file, rename the contents and, eventually, processess the files.
Invariably, if i Stop the Job before it has completed successfully, i notice that the underlying file (in this case, a .zip file) remains 'in use'. If i try and move the file or rename the file, the OS says "no can do; the file is in use".
but no matter where i look on the network when I go to Manage (right-clicking on My Computer), i cannot fine any reference under Shared Folders | Open Files to "close" the file.
can anyone shed some light on this? ie, how to close, etc.
We have some Deadlock alerts set up in SQL Agent that email us when the performance counter for deadlocks goes above zero. I've used the following script to identify the event file which has deadlock information in there.
select CAST(target_data as xml) as TargetData from sys.dm_xe_session_targets st join sys.dm_xe_sessions s on s.address = st.event_session_address where name = 'system_health'
Now that is fine, and we're looking into that (number of deadlocks appear to be 0.5) but out of interest ran a SQL Profiler session to capture the details as well and nothing is showing, I've received a few alerts and the trace file has information in there - but profiler shows absolutely nothing (all deadlock events are captured)
We are using partitions and all the table are properly aligned as per the partition keys. When this particular sp, which is inserting data to a table from a different table based on the partitionkeys is called by Web UI where threading has been applied, dead lock appears.
Let me make it more clear.
ThreadOne: Insert into table A(partitionKey,BatchId,...) select * from table B where partitionkey = 1 ThreadTwo: Insert into table A(partitionKey,BatchId,...) select * from table B where partitionkey = 2
I can see sometimes it gives deadlock for this procedure, not sure about the reason, as far as I guess since the tables are partitioned and escalation is set to Auto the deadlock should not occur.
We have a highly transactional database. It was owned by a third party before but now both the database and the application is on our site and we are trying to improve this project. So, we have a big (902919 rows), heap table, which is getting bigger and bigger everyday and sometimes deadlocks occur. The table has only 4 columns, "token", "type", "value" and "cacheTime", unique index cannot be created. It has one index on "token"(char(36)) and "type"(varchar(50)) ("value" should also be included but it is nvarchar(max)).
The driver table , which keeps track of what datamarts ran and for what date range gets updated frequently during the etl run . There can be as many as 250 updates issued on this table in a single second.
Now this table is a heap , and there are no indexes on it .
During these updates , we encounter deadlocks causing the ETL job to fail .
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?
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?
I've production sql server 7 sp3 on windows NT. I had a 8GB data file ofwhich 5GB were used and 3GB were unused. I wanted to take back the unused3GB.So I did the following with EM GUI:1. I tried to "truncate fre space from end of the file". Didn't truncatethe file. I believe there was no empty space at the end of the file.2. Next I chose the option to "shrink file to 5GB". And to my horror thedata file instead of taking just 5GB took the empty spaces also and the sizeof the used data file went to 8GB.Any idea what's going on?TIA,SP
Here's a really annoying problem. Let's say you have a text file with 2 million rows.Delimiters all look good and rows are previewed well but the file has a missing row at say lin 1234567 - way deep in the file. When SSIS encounters the blank row, an error is raised and processing on the file STOPS! I verified this in by checking the SSIS log and have even developed an error routine to notify me via email when the error occurs (really cool if I do say so myself ). The main problem still remains - how to resume processing from the point of failure in the file? Any help is appreciated. Thanks.
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.
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.
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.
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.
Here's an interesting problem. I have to set up connection managers for some files. The thing is, sometimes the files have data in them, sometimes not.
The files that don't have data in them just have some header info, so the file isn't technically empty, but I won't want to load these files when they're empty.
What would be an approach to solving this problem? I can't eliminate the file based on file size, since it's not 0, and there is no set file size that would be a reliable threshold, since they're small files to begin with.
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.
Can we have blank value in Primary key field? Two fields are chosen as Primary Key for this table but the issue is at any given time one value will be blank when other is populated. Does sql server still order the records based on these keys? (Clustered index). Or should I just go about adding ID (identity)?
I have a sql query that gets the count of exams held in each month.
Below is the code that I have used.
select Examid, count(*) as CumCount from [dbo].[Exams] where ExamCategory in ('Major','Critical') and Month(EXOCCRDATE) = Month(getdate()) and Year(EXOCCRDATE) = Year(getdate()) group by Examid
The code works good when we have data for the current month. When we dont have any exams for the current month, the code outputs empty values. I want the code to be altered so that when there is no value returned in the output, i want a default value shown in the output.
I have attached the sample data that I am using. In the data we dont have dates for the month of October. So when I run the code it will display empty output. So what I need is I need a text like 'No Data' to be shown when no value is returned by the query.
I have created some dynamic sql to check a temporary table that is created on the fly for any columns that do contain data. If they do the column name is added to a dynamic sql, if not they are excluded. This looks like:
If (select sum(Case when [Sat] is null then 0 else 1 end) from #TABLE) >= 1 begin set @OIL_BULK = @OIL_BULK + '[Sat]' +',' END
However, I am currently running this on over 230 columns and large tables 1.3 mil rows and it is quite slow. How I can dynamically create a sql script that only selects the columns in the table where there is data in a speedier manner. Unfortunately it has to be on the fly because the temporary table is created on the fly.
I have a requirement where i have to insert empty string in column whose datatype is decimal.
I have to replace the column value if it is null then insert it as ' '.
Obviously its generate error msg for conversion, is there any workaround for this. I cannot add 0 or other value as this column is used to generate some output value.
IIF(Column1 IS NULL, ' ', Column1))
I used TRY_PARSE but it insert null value if there is conversion error.
I am trying to open reports through an existing application. When I click the button to run the report, the new window opens, appears to be trying to load (the windows logo in the top corner is flowing, the hourglass is present), and then stops. I am left with a blank window, no report, and no error message.
I am able to view and run the reports through the Report Server. Other users are able to run the reports through the application.
Our last CheckDB failed on the 02/09. We were having problems with our SAN then and that got sorted out. The databases that it failed still has the snapshot showing in SQL Management Studio, screenshot exemple below (server name blanked out)
I reran CheckDB on the 04/09 on all the databases and the same databases that failed on the 02/09 failed again. I noticed in the log file, it tried to use the same snapshot file created on 02/09 to run CheckBD
I ran CheckDB manually on the databases that failed "DBCC CheckDB (WSS_Content_ce) with all_errormsgs" and did not get any errors back.
How do I remove the snapshot databases? We had a problem on 02/09 so the snapshot copy obvisouly has problems. I'd like to remove these snapshots and rerun a CheckDB on all the databases to ensure all is ok.
How can I empty an existing excel file before using DTS to export new data in this excel file? Or is there any way to delete this excel file from DTS task?
I am using this bcp out construct and it works fine except that if the query does not return values it bcp's out a file anyhow. This is not wanted and I am looking for a work around.
The subquery checks first in DBCleanerHist if a file already has been extracted onto hd and if so do not create an empty file and overwrite an existing file.
My team is working on a problem. Please help us solve it.
I am looping through a set of files and on each loop i process the file and move it to another folder. I am using File System task and variables with destination path and name, to do so . It works fine.
Requirement :
However now I want that after processing the file, instead of moving it, I create an empty text file at the destination containing the file name. I want to do this with minimum effort. Can anyone suggest me the way.
