Asked by: Hyon Gioo
asked in category: General Last Updated: 13th May, 2020

How can find DeadLock in SQL Server?

SQL Server: 8 different ways to Detect a DeadLock in a Database
  1. Using SP_LOCK, you can find the WAIT status for blocking sessions:
  2. Using sys.sysprocesses:
  3. Using common DMV:
  4. Using sys.dm_tran_locks:
  5. Enable required trace flags to log DeadLock related information in Tracefile:
  6. Count total number of DeadLock:

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Also to know is, what causes a deadlock in SQL Server?

The Cause of Every Deadlock in SQL Server A deadlock happens when two (or more) transactions block each other by holding locks on resources that each of the transactions also need. For example: Transaction 1 holds a lock on Table A. Deadlocks can involve more than two transactions, but two is the most common scenario.

Also, what is deadlock victim in SQL Server? SQL Server selects deadlock victim following these rules: The process with the lowest deadlock priority is set as deadlock victim. If the deadlock priority of all the processes involved in deadlock is same, then the process that is least expensive to rollback is selected as deadlock victim.

Just so, how can avoid deadlock in SQL Server?

Access objects in the same order.

  1. Access objects in the same order.
  2. Avoid user interaction in transactions.
  3. Keep transactions short and in one batch.
  4. Use a lower isolation level.
  5. Use a row versioning-based isolation level.

How can we solve deadlock?

Further Guidelines for Avoiding Deadlock

  1. AVOID NESTED LOCKS. The first idea is the simplest: don't acquire a lock if you already hold one.
  2. AVOID CALLING USER-SUPPLIED CODE WHILST HOLDING A LOCK.
  3. ACQUIRE LOCKS IN A FIXED ORDER.
  4. USE A LOCK HIERARCHY.
  5. EXTENDING THESE GUIDELINES BEYOND LOCKS.

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