30秒后在ASP.NET上超时，在SQL Server 2008 R2上没有超时

Question

I have a ASP.NET MVC3 project accessing a SQL server 2008 R2 database. If I run a statement in runtime, I get a timeout after 30 seconds. When running the same statement in SQL server management studio there is no timeout and I get a result after 3 seconds which is acceptable. While this is a test environment it seems I am the only person having sleeping processes from open windows in my management studio. To get access to the SQL server I use System.Data.SqlClient and have the connection string stored in the web.config When a controller wants to access the database I fetch the connection string

Data Source=192.168.111.111;Initial Catalog=agkamed_dev;Persist Security Info=True;User ID=test;Password=wrongpassword;MultipleActiveResultSets=true;

and in addition set

SET TRANSACTION ISOLATION LEVEL SNAPSHOT

Please ask, if any further information is required.

Question: What is responsible for the long delay on ASP.NET side?

Answer 1

Differences in performance / result of a query executed from C# and SQL Server Management Studio are often attributable to differences in ANSI settings.

Note that SSMS will by default set ANSI_NULLS, ANSI_PADDING, ANSI_NULLS on, which won't be the case for C# (see Tools/Options/Query Execution/SQL Server/ANSI)

I would suggest you experiment with setting these off one by one until you get the same behaviour as your C# code. Then modify your query so that it isn't dependent on these settings.

Answer 2

I couldn't find an answer to that problem yet. I sailed around that error by creating a function on the SQL server, although I'd rather find a solution for the problem because it isn't the first that this issue came up.