#Sql deadlock process id how to
#Sql deadlock process id zip

(for sake of simplicity I only added one parameter but you could use all required) var parameters = new DynamicParameters() I changed it custom parameters as shown below. As Dan suggested, I had automatic parameter building from input entity like this await connection.ExecuteAsync('', entity), where entity is an instance of C# model class. Then how come it could convert my query into such a deadly query? Well Dapper is great for most situation with out of box defaults, however, clearly, in my situation this default 4000 nvarchar killed it (please read Dan's answer for understanding how could such a query could cause problem). SET SellingPriceTa圎xclu = SellingPriceTaxInclu = 3 (The Fix) this could lead to deadlock on buffer (as per the Memory section of guide) decimal(29,0)) So both query wait for each other to complete in a hope to get some more buffer freed up. So what is deadlock on communication buffer? Well, if this query requires too much buffer to finish its execution then two such queries could start their execution at the same time and start claiming the buffer they need but at some point available buffer might not be enough and they'll have to wait for more buffer freed up from completion of execution of other queries. As Dan pointed out, in my case, following query appeared in deadlock report which was using way too much buffer (as a result of inefficient query). In my case I was getting deadlock on communication buffer so as per this guide the Memory (the Memory section of Detecting and Ending Deadlocks guide) must have been causing the problem. Then read this report in conjunction with Detecting and Ending Deadlocks guide to understand the root cause of your deadlock issue. Locate the deadlock event corresponding to your sql exception timing/data. I used following query but you could also use the query suggested (in comment section to this question).

#Sql deadlock process id how to

But, I'd like to summarize what went here, what I learned and a step by step approach on how to troubleshoot deadlock on communication buffer (or any deadlock for that matter).

#Sql deadlock process id zip

It is a zip helped so I had to upvote/choose his answer as accepted answer. Please click on the following link then in top right corner click download. At all the times when this issue occurred, CPU usage was noticed under 20% (mostly around 10%, only one occasion 20%, RAM was under 30% on all occasions).ĭeadlock XML Event as per Guzman's requestįile size was too large for this post so created this google drive file. Usual workload on this server is 10% CPU and 30% RAM, occasionally it goes up to 80% CPU and 350GB RAM. We have Microsoft Sql Server 2016 On Azure hosted in virtual machine with 64 cores and 400GB RAM. Persistent retry policy as a workaround (to handle random transient nature of the issue).Keeping transactions as small as possible.Alter DATABASE XXXXXX SET READ_COMMITTED_SNAPSHOT ON/OFF.Ensuring ports/RAM/CPU/network bandwidth are not exhausted.Restarting SQL server/application instance.Ensuring only 1 entity CRUD at given point in time for the one kind of entity.For insert/update/delete C# line looks like this await connection.ExecuteAsync('', entity) For GET requests we simply run await connection.QueryFirstOrDefaultAsync('', entity) There are 5 types of entity (all presenting simple non relational tables). To do this, Connection manager (registered as a scoped service) opens a new IDbConnection connection in request scope this connection is used to execute deletes, inserts, updates or get. net core Web API that takes in requests and performs CRUD operations to a database hosted on this Microsoft Sql server. Specific Details of Scenario : We have a very simple Dapper ORM based C#. If you interested in specific details then read on. I've tried enough guessed/random things I need exact step by step guide on how to troubleshoot deadlock on communication buffer. Let me be clear, this is not row or table level locking. We've been randomly getting Transaction (Process ID xx) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim.

So, here I go again with more specific details of my problem. There are varying versions of this question on stackoverflow already, but none of them helped me to get to the bottom of my issue.