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BEGIN UPDATE PendingRequest SET RetriesUsed = @RetriesUsed, Status = @Status WHERE ConversationHandle = @ConversationHandle END ELSE BEGIN INSERT INTO PendingRequest (ConversationHandle, RequestBody, RetriesUsed, Status) VALUES ( @ConversationHandle, @RequestBody, @RetriesUsed, @Status ); END COMMIT; END GO You can use the sp_AddOrUpdatePendingRequest stored procedure to insert a new failed web request into the PendingRequest table. This is done when the web request fails for the first time. On the other hand, you can use the sp_AddOrUpdatePendingRequest stored procedure to update the RetriesUsed and the Status column of the PendingRequest table. This is done when the execution of a pending web request fails again (until the configured maximum limit is reached). Inside the managed service program, the SavePendingRequest method uses the sp_AddOrUpdatePendingRequest stored procedure to put the failed web request into the PendingRequest table. Listing 10-16 shows the implementation of the SavePendingRequest method. Listing 10-16. Implementation of the SavePendingRequest Method private void SavePendingRequest(httpRequestType incomingRequest) { SqlCommand cmd = s_connection.CreateCommand(); cmd.CommandText = "sp_AddOrUpdatePendingRequest"; cmd.CommandType = CommandType.StoredProcedure; cmd.Transaction = s_transaction; cmd.Parameters.AddWithValue("@ConversationHandle", s_currentConversation.Handle); cmd.Parameters.AddWithValue("@RetriesUsed", ++m_numRetriesUsed);

Recognize that the metrics can only have a positive, long-term impact if you have a clear organizational destination in mind (i.e., you ll have significantly different KPIs if your goal is to grow the organization by 50 percent annually and expand into new geographies than you will if your goal is to maintain 10 percent growth and maximize profitability). Teams that are developing KPIs must take great care to ensure that the selected metrics that are forward looking will actually lead toward the organization s projected destination. This statement may at first seem obvious, but it is a common failure for a team developing KPIs to become so enthralled with the process of developing creative metrics that it loses track of the need to deliver simple, unambiguous metrics that are clearly linked with the organization arriving at a destination.

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@security_mode = 0, @login = 'spaul', @password = null go Except for the sp_link_publication stored procedure, all the other steps are executed on the Publisher server. In this section I discussed the configuration of transactional publications with updatable subscriptions. In the next section, I will show you how to configure queued updating subscriptions.

We have already configured the publication for queued updates while setting it up for updatable subscriptions (see the Configuring Transactional Publication with Updatable Subscriptions section of the chapter). The steps that you now need to take to create a queued updating push subscription are as follows:

if (s_msgReceived.Type == x_httpRequestMessageType) { MemoryStream stream = new MemoryStream(); XmlSerializer xs = new XmlSerializer(typeof(httpRequestType)); xs.Serialize(stream, incomingRequest); cmd.Parameters.AddWithValue("@RequestBody", stream.ToArray()); } else { cmd.Parameters.Add("@RequestBody", SqlDbType.VarBinary).Value = DBNull.Value; } if (m_lastError == null) cmd.Parameters.AddWithValue("@Status", DBNull.Value); else cmd.Parameters.AddWithValue("@Status", m_lastError); try { cmd.ExecuteNonQuery(); } catch (SqlException e) { SqlContext.Pipe.Send(e.Message); } } The SavePendingRequest method calls the sp_AddOrUpdatePendingRequest stored procedure to update the PendingRequest table. The method also increments the m_numRetriesUsed member variable to reflect the retry count of the current failed web request. After the retry mechanism stores the pending web request in the PendingRequest table, the BeginTimer method is called from the ServiceRequest method. The main purpose of this method is to start a Service Broker conversation timer. You use the BEGIN CONVERSATION TIMER T-SQL statement to do this. Listing 10-17 shows the syntax of this T-SQL statement. Listing 10-17. Syntax of the BEGIN CONVERSATION TIMER T-SQL Statement BEGIN CONVERSATION TIMER (conversation_handle) TIMEOUT = timeout Table 10-3 describes the arguments of the BEGIN CONVERSATION TIMER T-SQL statement.

1. Verify that the publication supports queued updating subscriptions. 2. Verify that the publication supports push subscriptions. 3. Add the push subscription on the Publisher server. 4. Add the push subscription agent on the Publisher server. The publication is verified by executing the sp_helppublication stored procedure. Ensure that the value of the allow_queued_tran column is 1 and that the allow_push column is also set to 1. Steps 3 and 4 configuring the push subscription for queued updating are performed by the script in Listing 9-15. Listing 9-15. Configuration of the Push Subscription for Queued Updating /* Add the push subscription on the Publisher server */ use mysales_copy go exec sp_addsubscription @publication = 'pub_updsub_mysales_copy', @subscriber = 'BIOREPL\BIOREPL_PEER', @destination_db = 'mysalescopy_qud_remotepush', @subscription_type = 'Push', @sync_type = 'automatic', @article = 'all', @update_mode = 'queued failover', @subscriber_type = 0 /* Add the push subscription agent on the Publisher */ exec sp_addpushsubscription_agent @publication = 'pub_updsub_mysales_copy', @subscriber = 'BIOREPL\BIOREPL_PEER', @subscriber_db = 'mysalescopy_qud_remotepush', @job_login = null, @job_password = null, @subscriber_security_mode = 1, @frequency_type = 64, @frequency_interval = 0, @frequency_relative_interval = 0, @frequency_recurrence_factor = 0,

Specifies the conversation for which the dialog timer is set up. The conversation_handle must be a UNIQUEIDENTIFIER data type. Specifies the amount of time (in seconds) to wait before putting the message on the queue.

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