It is (to my knowledge) passing in different parameters. What I am looking for is why I am getting a DELETE/DELETE deadlock. I would have thought there would have to be a SELECT/UPDATE query running to cause the deadlock? But looks like it is DELETE/DELETE deadlock. The deadlock occurs on a simple DELETE statement. Thanks to all for the attention.I get a deadlock when a SQL Server Job runs. Monday, Novem12:11:02 PM - Viacheslav Maliutin Plerase share If a Table Has More Than One Foreign Key? how did you fix all these. It is going to be published soon.įriday, Ma1:40:01 PM - Pradeep Kumar Giri Here is the second one explaining the issue with multiple foreing keys. Pradeem Kumar Giri, thank you for the reading my article. Saturday, Ma8:25:51 AM - Viacheslav Maliutin i.e reteriving data from more tables concurrently please go for a little bit more complex case. I would be interested how you resolved a table with multiple foreign keys. The execution plan for both steps 7 and 8 will now look like this. To get only one city it is better to use a seek in the index for the row id and These dummy cities create statistics that tells SQL Server that if a client wants Script 10 below will show us all the locks have been acquired in the database. In order to understand the reason of the deadlock we need to take a look at what I will explain this in detail and how this solved this problem. To solve the deadlock you just need to cluster the foreign key “FK_Country”. Understanding and Solving the SQL Server Deadlock Issue Now let me solve the problem with a good problem explanation and a good solution. To tell our developers, but unfortunately they can’t change the way the SQL Why we have the problem I am talking about. Actually, it never writes the “*”, but it picks up everyĬolumn and that’s why my scripts 8 and 9 are written that way and that’s Yes, this will work inĪ perfect world, but when using an ORM it writes the SQL like “SELECT * FROM With the “CityName” column in scripts 8 and 9. So, to not have a deadlock just replace the “*” symbol in the SELECT queries On the “CountryID” column and included the “CityName” column. You might say: “Hey, you created an index “ IX_City_Not_Covering_Index” In query window #1, select data from the City table for the USA records. This willġ9980000, -As Google just said and that's cool! Transaction, but not committing or rolling back the transaction. In query window #1 run the following code. The same T-SQL command with different data to show how the deadlock will be reproduced. In the scope of each transaction I will run Wanted to show that our system had many useful indexes and even with useful indexesĪs usual, to demonstrate a deadlock we need two connections to be opened. You might have noticed that I created an index on the “CountryID”Ĭolumn and included the “CityName” column. script 1 - Creation of County and City tables
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