She primarily focuses on the database domain, helping clients build short and long term multi-channel campaigns to drive leads for their sales pipeline. Nupur Dave is a social media enthusiast and an independent consultant. If you need help with any SQL Server Performance Tuning Issues, please feel free to reach out at is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2). Pinal is an experienced and dedicated professional with a deep commitment to flawless customer service. To freely share his knowledge and help others build their expertise, Pinal has also written more than 5,500 database tech articles on his blog at. Pinal has authored 13 SQL Server database books and 40 Pluralsight courses. He holds a Masters of Science degree and numerous database certifications. ![]() Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 17 years of hands-on experience. So use this technique in the special cases as described earlier.ĭo you use the deadlock priority in your business logic? If yes, please share your experience in the comment. While the statement above made sure that the important transaction does not deadlock the other transactions got deadlock more often.Įventually, the trick described in this blog post did reduce deadlock for the important transaction but did not lower the total number of the deadlock. The statement above specified the relative importance of the current session if it is deadlocked with another transaction. I opened the stored procedure which was very important for the transactions and typed the following statement at the beginning of the stored procedure. This lead to only one solution and that was to set up the deadlock priority. Additionally, the client was just fine with the deadlocking other transactions/threads but not one specific transaction. I have also turned off parallellism on the server. The best solution is always to re-write the code so there is no deadlock but as I mentioned it was not possible as an immediate solution. This is strange since there are no other sessions accessing the db. After investigating a bit I figured out that they have a table called invoices where the deadlocks are happening due to a few large concurrently updates. The first thing I did was to understand what is doing creating the deadlock. This was totally fine to me as I did not want to also divide deep in the code and fix the deadlock as it can sometimes take a long time to understand the business logic. Another requirement was that I can’t change much of the code across their system. The requirement of the client was, no matter what happens they do not want that transaction to deadlock at all. ![]() ![]() Let us learn today how to Reduce Deadlock for Important Transactions With Minimum Code Change. They had one transaction which was often the victim of deadlock. A large financial organization recently hired me to help them with one particular issue. Another day and another question from my client of Comprehensive Database Performance Health Check.
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