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Revati S Misra

Revati S Misra

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Aryan Kumar

Aryan Kumar

02-Aug-2023

A deadlock error occurs when two or more transactions are waiting for each other to release a lock on a resource. This can happen when two transactions are trying to update the same row in a table, or when they are trying to access the same database object in different orders.

There are a few things you can do to try to resolve a deadlock error:

  • Check the deadlock graph. The deadlock graph is a report that shows the sequence of locks that led to the deadlock. This can help you to identify the specific transactions that are involved in the deadlock, and to determine the order in which they are trying to access the resources.
  • Change the order of the locks. If the deadlock is caused by two transactions trying to access the same resource in different orders, you can try to change the order of the locks in your queries. This will prevent the two transactions from getting into a deadlock situation.
  • Use the WITH ROWLOCK hint. The WITH ROWLOCK hint tells SQL Server to only lock the specific row that you are updating, rather than the entire table. This can help to reduce the chances of deadlocks.
  • Use a transaction timeout. You can set a timeout for your transactions. If a transaction exceeds the timeout, it will be rolled back automatically. This can help to prevent deadlocks from causing your database to become unavailable.

If you are still having trouble resolving the deadlock error, you may need to contact your database administrator for assistance.

Here are some additional tips for preventing deadlocks:

  • Use indexes to improve the performance of your queries. This can help to reduce the number of locks that are required, and to prevent deadlocks from occurring.
  • Use transactions to group related operations together. This will help to ensure that all of the locks that are required for a transaction are released at the same time.
  • Monitor your database for deadlocks. You can use the system_health session to view a list of deadlocks that have occurred in your database. This will help you to identify the queries that are causing deadlocks, and to take steps to prevent them from happening in the future.
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