#SQL DEADLOCK ERROR CODE#

Measure 'Estimated Improvement' from the Database Tuning Advisor when run for the queries involved in the deadlock, especially in SQL Server 2005. Improve Indexes or Indexing wherever possible Use the SET SHOWPLAN_ALL ON command and examine the query plan. Take special note of any table scans, index scans and lengthy sorts shown in the query plan. Often the simplest way to prevent deadlocking is to simple make the queries involved better. It may be possible to reduce the amount of resources the query is locking. A Query that locks fewer resources is less likely to deadlock. Some general hints would include the following: Improve Efficiency of Queries a server that is too busy can have an application removed, drives added for SQL, etc.).

#SQL DEADLOCK ERROR CODE#

Deadlocks are most often solved by a change to application code or stored proc (which should only be done by Support), or by a change to an index, or sometimes by a change to the 'load' on a server (i.e. This should be done with Support while reviewing the specific deadlocks that are occuring. Once all relevant information is gathered, the next step is to solve the deadlock and prevent it from happening. SQL Server will then cancel the victim SPIDs current batch and roll back its transactions.ĭeadlocking is most often an indication of an overloaded server thus, you may simply need to deploy additional resources or look for performance tuning to relieve the stress on the SQL Server engine. The action taken in the normal course of affairs is that SQL Servers built-in deadlock detection engine will choose one of the participants as a deadlock victim, generally the participant that has done the least work. Additionally, blocking will resolve itself naturally, but a deadlock will exist until action is taken to remove it. Except in some exceptional circumstances deadlocks are a consequence of blocking but deadlocking can be seen as blocking in an infinite loop. The transactions cannot be committed or rolled back because the resources they are waiting on are owned by the other thread. Both threads cannot release resources until their transactions are committed or rolled back. Where blocking occurs where one transaction is waiting on resources in use by another transaction, deadlocking refers to the situation where two or more threads are waiting for resources in a circular blocking chain. This situation should not be confused with blocking as they are dissimilar. It does not relate specifically to SQL Server, or to any RDBMS. A deadlock is a condition that can occur on any multi-threaded system.

Sql deadlock error