Blocking caused by -1/Negative SPID

I received a request from my development team for a query which is stuck and not giving any result and no error throwing.

I thought for a moment and start troubleshooting by checking the blocking. I caught the issue as blocking was there. The major blocking spid was -1.

I prepared a solution of this problem for everyone by collecting the information from different sources.


What is -1 spid?

SPIDs with a value of -1 are orphaned distributed transactions. It is a distributed transaction for which the transactional state is unknown. A distributed transaction is a database transaction that involves more than one database system (usually) located on different servers.

These negative values may be -1, -2 etc.

The process responsible for coordinating these transactions is the Microsoft Distributed Transaction Coordinator, or MSDTC.

How to Kill Negative SPId:

Open a new query window and execute the script:

select  * from sys.syslockinfo

 You will get the result as below:

UOW (Unit of work)


Here, need to check the UOW (Unit of work), it would be a 24 character long id, Copy the UOW id and then kill it.

Kill ‘CD947343-36F5-4515-B4CB-3A42402C8207’

Thank You!


About Mirza Husain

Mirza Husain is a senior consultant-database and having more than 10+ years of experience in the IT industry with different domains. He is fond of writing and speaking about SQL Server and also keen to learn new technologies. He is holding MCA degree and having Microsoft certifications as MCP & MCTS. He is also ITIL certified. In his past years, he worked with many clients as Microsoft, Bank of America etc. Currently he is associated with a France based client and offering his best services. You may reach him on his email id -- Thanks!
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