SQL Server Deadlocks - Easy Quick Start Guide
If you find the topic of SQL Server deadlocks a little intimidating and mysterious, you are not alone. But fear not, this Quick Start lays out the practical shortcut I bet is sufficient for most scenarios. Definition: What is a Deadlock A deadlock occurs when 2 threads are competing for similar resources, and Thread 1 HAS A and WANTS B, and Thread 2 HAS B and WANTS A. They’re stuck. SQL Server picks a loser and throws error 1205 "Transaction... has been chosen as the deadlock victim." The BIG PROBLEM if your application has a lot of deadlocks is unpredictable application behavior . This can especially show up in apps that call large stored procs where the failing statement gets rolled back, but the proc itself may just keep on trucking with the next statement. This is all based on what kind of error handling you're doing, whether you have XACT_ABORT on, whether you're doing explicit transactions with BEGIN TRAN or not, etc. Very Probably your application is no