Diagnosing Deadlocks in SQL Server 2005: Unraveling the Mystery
2024-09-05
USE [AdventureWorks2005]; -- Replace with your database name
BEGIN TRANSACTION;
UPDATE HumanResources.Employee
SET NationalIDNumber = '123456789'
FROM HumanResources.Employee AS emp
INNER JOIN Person.Person AS p ON emp.PersonID = p.PersonID
WHERE p.FirstName = 'John';
-- Simulate a delay to increase deadlock chance
WAITFOR DELAY '00:00:05'; -- Adjust the delay time as needed
UPDATE Person.Person
SET LastName = 'Doe'
FROM HumanResources.Employee AS emp
INNER JOIN Person.Person AS p ON emp.PersonID = p.PersonID
WHERE p.FirstName = 'John';
COMMIT TRANSACTION;
BEGIN TRANSACTION;
UPDATE Person.Person
SET LastName = 'Smith'
FROM HumanResources.Employee AS emp
INNER JOIN Person.Person AS p ON emp.PersonID = p.PersonID
WHERE p.FirstName = 'John';
-- Simulate a delay to increase deadlock chance
WAITFOR DELAY '00:00:05'; -- Adjust the delay time as needed
UPDATE HumanResources.Employee
SET NationalIDNumber = '987654321'
FROM HumanResources.Employee AS emp
INNER JOIN Person.Person AS p ON emp.PersonID = p.PersonID
WHERE p.FirstName = 'John';
COMMIT TRANSACTION;
This code simulates two transactions trying to update the same data in the AdventureWorks2005 database (replace with your actual database name). The WAITFOR DELAY statements create a short pause, increasing the chance of a deadlock if another process tries to access the same data concurrently.
Here's a summary of the pros and cons of each method:
| Method | Pros | Cons |
|---|---|---|
| SQL Server Profiler | Familiar tool, easy to set up | Requires configuration for deadlock capture, data analysis can be manual |
| Error Messages | Provides starting point for investigation | Limited information, reactive approach |
| Activity Monitor | Real-time view of blocking situations | Might not provide enough details for root cause analysis |
| Extended Events (XEvents) | Highly customizable data capture | Requires configuration, less familiar than Profiler for some users (SQL Server 2005) |
| Third-party tools | User-friendly interface, additional functionalities | Additional cost, potential integration complexity |
sql-server sql-server-2005 deadlock
