Store update, insert, or delete statement affected an unexpected number of rows (0).

Question

Hi,
During load testing my application, I am getting this error.
Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded.
Scenario being, I am trying to retrieve bearer token from my web api application for the user by passing username, password, client Id and grant type. (Out of 100 threads around 80 are failing).
Attached images of error and the piece of code where error occured.
Am I missing something. Relatively new to this topic.
Please let me if further details required

Answer 1

Hi @Roshan Kumar ,

Welcome to Microsoft Q&A platform and thanks for using Azure Services.

As I understand from the question, Store update, insert, or delete statement affected an unexpected number of rows (0).

The exception means that between time when you fetched data from database and modified it, your data had been changed.

Please refer to Saving Changes and Managing Concurrency for more details.

You can try use refresh method to fix it.

 try {  
     context.SaveChanges();  
 } catch (OptimisticConcurrencyException) {  
     context.Refresh(RefreshMode.ClientWins, yourentity);  
     context.SaveChanges();  
 }  

More discussions link for this issue which might be useful:

solution-for-store-update-insert-or-delete-statement-affected-an-unexpected-n
entity-framework-store-update-insert-or-delete-statement-affected-an-unexpec

Hope this will help. Please let us know if any further queries.

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