How would you optimize a slow running stored procedure?

How would you optimize a slow running stored procedure?

Improve stored procedure performance in SQL Server

1. Use SET NOCOUNT ON.
2. Use fully qualified procedure name.
3. sp_executesql instead of Execute for dynamic queries.
4. Using IF EXISTS AND SELECT.
5. Avoid naming user stored procedure as sp_procedurename.
6. Use set based queries wherever possible.
7. Keep transaction short and crisp.

Are deadlocks bad?

Deadlocks can kill an application’s performance. Users will complain about the app being slow or broken. Developers will ask the DBA to fix the problem, DBAs will push the problem back on developers.

How can avoid deadlock in SQL Server stored procedure?

Stored procedure deadlocking itself, how do I resolve it?

1. Removing the explicit transaction control.
2. Removing the PK and making UserID the (non-unique) clustered index.
3. Implementing some boolean logic in the second UPDATE to avoid running it unnecessarily.

Where can I set deadlock _ priority in my…?

SET DEADLOCK_PRIORITY… command in my stored procedure. Does it need to be before I begin a transaction? Or can it be anywhere in the transaction? Thanks all!

What happens when both sessions have the same deadlock priority?

If both sessions have the same deadlock priority, the instance of SQL Server chooses the session that is less expensive to roll back as the deadlock victim. For example, if both sessions have set their deadlock priority to HIGH, the instance will choose as a victim the session it estimates is less costly to roll back.

Is there a way to avoid deadlock in SQL?

Although a better solution would probably be to avoid the deadlock if possible. You may also want to note that any priority change inside a stored procedure is reset to the priority of the calling session when the procedure exits: Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.

What happens when two SQL Server sessions are deadlocked?

When an instance of SQL Server detects that two sessions are deadlocked, it resolves the deadlock by choosing one of the sessions as a deadlock victim. The current transaction of the victim is rolled back and deadlock error message 1205 is returned to the client.