Quiz on deadlocks

Part of "Troubleshooting Blocking and Deadlocks for Beginners (2 hours 10 minutes)"

Page content

Grab a pen and notepad, and jot down your answers as you go, then check your answers at the key at the bottom of the page.

Questions

Q1. What does a deadlock graph NOT contain?

  •  Inputbuffer for the sessions involved
  •  Locks requested by the sessions involved
  •  Locks obtained by the sessions involved
  •  Execution plans for the sessions involved

Q2. Why not just pick up deadlock information from the System Health Extended Events session?

  •  The System Health session is only available in SQL Server v.Next
  •  Data in the System Health session doesn’t persist after restart
  •  The System Health session requires that you use Profiler to read it
  •  The System Health session never picks up deadlocks

Q3 Why does the index in the video prevent the deadlock from happening?

  •  The index was created with NOLOCK
  •  Update statements can only ever lock one index at a time
  •  Update statements can only ever lock the Clustered Index of a table
  •  The new index doesn’t contain the LatestRecordedPopulation column

Scroll down for the answer key 👇

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

Answer Key

  • A1. 4. Execution plans for the sessions involved.
  • A2. 2. Data in the System Health session doesn’t persist after restart
  • A3. 4. The new index doesn’t contain the LatestRecordedPopulation column.