Keep in mind that the transaction which gets aborted due to a deadlock may not be the cause of deadlocks if there are other transactions on the same tables. The best defense against deadlocks is to catch deadlocks in your application and log enough information about the transaction so that you can determine which parts of your application are prone to deadlocks when they do occur. To view deadlocks that have occurred in the past, you can query the deadlock events from the Azure SQL master database by following this blog post. A deadlock has to be one of the most frustrating error messages that SQL Server can. If deadlocks are consistently happening, you can query the following system databases to view currently active transactions to try and figure out which one is causing the deadlock, but this method can be tedious on databases with many active transactions: process and has been chosen as the deadlock victim. Unfortunately, deadlocks can be difficult to troubleshoot. Error: Transaction (Process ID 129) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. ![]() Here is an example of the response returned from a transaction that is aborted due to deadlock: Failed to execute query. When a deadlock is detected, the server will abort one of the involved transactions, rolling it back, and allowing the other transactions to proceed. Blue Matador detects deadlocks in Azure SQL by monitoring the deadlock metric on your SQL databases.ĭeadlocks will prevent the involved transactions from completing. A deadlock is caused when two or more transactions hold locks that the other transactions require.
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