SQL Queue停止工作並填滿消息

Question

目前我正在與SQL經紀人掙扎。 一切似乎配置得很好，但隊列停止工作並填滿未發送的消息。 代理和隊列已啟用。 如果我刪除隊列和服務並重新創建它們，它會工作一段時間但稍后會再次停止。 我沒有在sql server日志中看到任何重要錯誤。 那么什么可能導致錯誤？

謝謝

隊列

CREATE QUEUE [dbo].[DataChangeQueue] WITH STATUS = ON , RETENTION = OFF , ACTIVATION (  STATUS = ON , PROCEDURE_NAME = [dbo].[DataChangeQueueProc] , MAX_QUEUE_READERS = 100 , EXECUTE AS N'dbo'), POISON_MESSAGE_HANDLING (STATUS = ON)  ON [PRIMARY]

服務

CREATE SERVICE [DataChangeService]  AUTHORIZATION [dbo]  ON QUEUE [dbo].[DataChangeQueue] ([http://schemas.microsoft.com/SQL/Notifications/PostQueryNotification])

C＃

    public DatabaseNotificationService()
    {
        SqlDependency.Start(m_SQLConnectionString, "DataChangeQueue");

        if (IsAccessGranted())
        {
            ConnectToDatabase();
        }
    }

    ~DatabaseNotificationService()
    {
        SqlDependency.Stop(m_SQLConnectionString, "DataChangeQueue");
    }


    private void ConnectToDatabase()
    {
        using (SqlConnection sqlConnection = new SqlConnection(m_SQLConnectionString))
        {
            sqlConnection.Open();

            using (SqlCommand sqlCommand = sqlConnection.CreateCommand())
            {
                sqlCommand.CommandType = CommandType.Text;
                sqlCommand.CommandText = GetSQLCommandText();
                sqlCommand.Notification = null;

                if (m_SQLDependency != null)
                {
                    m_SQLDependency.OnChange -= DependencyOnChange;
                    m_SQLDependency = null;
                }

                m_SQLDependency = new SqlDependency(sqlCommand, "Service=DataChangeService;Local Database=aspnetdb", 1800);
                m_SQLDependency.OnChange += DependencyOnChange;

                sqlCommand.ExecuteReader();
            }

            sqlConnection.Close();
        }
    }


    private void DependencyOnChange(object sender, SqlNotificationEventArgs e)
    {
        using (SqlConnection sqlConnection = new SqlConnection(m_SQLConnectionString))
        {
            sqlConnection.Open();

            using (SqlCommand cmd2 = sqlConnection.CreateCommand())
            {
                cmd2.CommandType = CommandType.Text;
                cmd2.CommandText = GetOnChangeSQLCommandText();

                using (SqlDataReader sqlDataReader = cmd2.ExecuteReader())
                {
                    if (sqlDataReader != null)
                    {
                        sqlDataReader.Read();

                        List<String> keys = new List<String>(m_Clients.Keys);
                        foreach (String key in keys)
                        {
                            IDatabaseNotificationCallbackContract client;
                            if (m_Clients.TryGetValue(key, out client))
                            {
                                if (((ICommunicationObject)client).State == CommunicationState.Opened)
                                {
                                    client.SendNotificationToClients(sqlDataReader.GetValue(0).ToString());
                                }
                                else
                                {
                                    m_Clients.Remove(key);
                                }
                            }                    
                        }
                    }
                }
            }

            sqlConnection.Close();
        }

        if (m_SQLDependency != null)
        {
            m_SQLDependency.OnChange -= DependencyOnChange;
            m_SQLDependency = null;
        }

        //Reconnect to database for listening to following changes.
        ConnectToDatabase();
    }

Answer 1

當隊列“停止”時它仍然啟用嗎？

如果沒有，您可能正在處理隊列中的有害消息 。 他們可以停止處理

我建議檢查第一條消息，看看它是否對您的處理有效。

如果不是，則將其彈出。

這是我用來從消息隊列中刪除第一個對話（因此也就是有害消息）的代碼：

BEGIN TRANSACTION;

DECLARE @handle nvarchar(100);
RECEIVE TOP(1) @handle = [conversation_handle] FROM yourQueueName;

END CONVERSATION (@handle)
    WITH ERROR = 127 DESCRIPTION = N'Unable to process message.' ;
GO

COMMIT TRANSACTION;