在 SQL 中，默认的最大事务超时是多少

Question

如果 machine.config 中不存在“system.transactions”元素，maxTimeout（参见示例）的 machine.config 中的默认值是多少？

<system.transactions>
   <machineSettings maxTimeout="??:??:??" />
</system.transactions>

我问这个是因为代码由于以下异常而崩溃，并且似乎与事务超过超时有关，它在 SaveChanges 方法期间崩溃，我收到的异常如下：

The transaction associated with the current connection has completed
but has not been disposed. The transaction must be disposed before
the connection can be used to execute SQL statements.

这是崩溃的代码：

using (TransactionScope transaction = TransactionHelper.CreateTransactionScope())
{
    using (EFContext efDBContext = new EFContext())
    {
        try
        {
            efDBContext.Connection.Open();  

            foreach (MyEntity currentEntity in myEntities)
            {
                //Insertion
            }

            transaction.Complete();
        }
        catch (Exception ex)
        {
            //Inspect current entity
            //Get Total Time of the run
            //Number of entities processed
        }
        finally
        {
            if (esfDBContext.Connection.State == ConnectionState.Open)
                esfDBContext.Connection.Close();
        }
    }
}

这就是我创建TransactionScope的方式：

public static TransactionScope CreateTransactionScope(TransactionScopeOption option = TransactionScopeOption.Required, IsolationLevel isolationLevel = IsolationLevel.ReadCommitted)
{
    var transactionOptions = new TransactionOptions()
    {
        Timeout = TimeSpan.MaxValue,
        IsolationLevel = isolationLevel
    };

    return new TransactionScope(option, transactionOptions);
}

Answer 1

默认 = 10 分钟。最大 = Infinity

Answer 2

没有服务器端超时是MS SQL。

始终是客户端在设定的持续时间后引发异常。

http://blogs.msdn.com/b/khen1234/archive/2005/10/20/483015.aspx

你真的很想看看命令超时。

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout.aspx

这里的默认值为 30 秒。