title: Parallel query worker thread was involved in a deadlock
body: <p>I run an SQL Server Trace to track some deadlocks issues and I was hit on the head with this comment <code>Parallel query worker thread was involved in a deadlock</code> as a reason for the deadlock.</p>
  
  <p><img src="https://i.stack.imgur.com/ShLAI.png" alt="enter image description here"></p>
  
  <p><strong>Q1:</strong> Does this means that the same query is deadlocking it self? The query execution plan shows some parallelism cases.</p>
  
  <p><strong>Q2:</strong> What are the possible ways to "force" SQL Server not to use parallelism or at least to avoid using it as much as possible?</p>