timeout setting for SQL Server

Question

Hello everyone,

I am using VSTS 2008 + ADO.Net + C# + .Net 3.5 + SQL Server 2008. I am using ADO.Net at client side to connect to database server to execute a store procedure, then return result from the store procedure.

Here is my code. I have two issues about timeout,

1. If I do not explicitly set any timeout related settings, for the connection to database server, are there any timeout settings (e.g. if can not connect to database server for some default amount of time, there will be some timeout exception?)?

2. If I do not explicitly set any timeout related settings, for the execution of the store procedure, are there any timeout settings (e.g. if can not retrieve results from server to ADO.Net client for some default amount of time, there will be some timeout exception?)?

       using (SqlConnection currentConnection = new SqlConnection("Data Source=.;Initial Catalog=TestDB;Trusted_Connection=true;Asynchronous Processing=true"))
       {
           // check current batch conut
           currentConnection.Open();
           using (SqlCommand RetrieveOrderCommand = new SqlCommand())
           {
               RetrieveOrderCommand.Connection = currentConnection;
               RetrieveOrderCommand.CommandType = CommandType.StoredProcedure;
               RetrieveOrderCommand.CommandText = "prc_GetOrders";
               RetrieveBatchCountCommand.Parameters.Add("@Count", SqlDbType.Int).Direction = ParameterDirection.Output;
               RetrieveBatchCountCommand.ExecuteNonQuery();
               int rowCount = Convert.ToInt32(RetrieveOrderCommand.Parameters["@Count"].Value);
           }
       }
   

thanks in advance, George

Answer 1

Yes, there are 2 kinds of timeout that can be set

1. Connection timeout
2. Command timeout

Both default to 30 seconds in VBA, .net etc

Answer 2

As gbn already mentioned, there are two types of timeouts:

1) Connection Timeout: this is controlled by your connection string:

Data Source=.;Initial Catalog=TestDB;
   Trusted_Connection=true;Asynchronous Processing=true

If you add a Connect Timeout=120 to this string, you're connection will try for 120 seconds to get opened and then aborts.

Data Source=.;Initial Catalog=TestDB;
   Trusted_Connection=true;Asynchronous Processing=true;
   Connect Timeout=120;

2) Command timeout: for each command, you can also specify a timeout - ADO.NET will wait for that amount of time before cancelling out your query. You specify that on the SqlCommand object:

    using (SqlCommand RetrieveOrderCommand = new SqlCommand())
    {
       RetrieveOrderCommand.CommandTimeout = 150;
    }

Marc