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Figure 5-14. Configure the category axis. 41. Click Labels, shown on the left of Figure 5-14, and select the Disable auto-fit radio button. Type 90 for the Label rotation angle. Click OK. 42. Right-click the y axis values, and change the number format to currency with 0 decimal places, 43. Right-click the x axis (territory labels), and select Axis Properties Line. Click the fx button under Line color ; enter #c0c0c0 in the expression box, and click OK. Repeat this step for the y axis to change both axes to a grey color. Repeat for the Line color property under Major Tick Marks for both the x and y axes. 44. Preview your report, and arrange it to resemble Figure 5-15.

The second functionality of this sample application is to order items through a message of type [http://ssb.csharp.at/SSB_Book/c05/InventoryQueryRequestMessage]. When this message type arrives at the InventoryTargetQueue, the associated managed stored procedure performs the following actions: Checks if the needed quantity is available in the inventory Calculates the new items count in the inventory Sends a response message back to the sender with the result Listing 5-24 shows the ProcessInventoryQueryRequest method that handles all three tasks. Listing 5-24. ProcessInventoryQueryRequest Method [BrokerMethod("http://ssb.csharp.at/SSB_Book/c05/InventoryQueryRequestMessage")] public void ProcessInventoryQueryRequest Message ReceivedMessage, SqlConnection Connection, SqlTransaction Transaction) { try { XmlDocument doc = new XmlDocument(); doc.LoadXml(ReceivedMessage.BodyAsString); XmlNodeList list = doc.GetElementsByTagName("InventoryId"); string inventoryId = list.Item(0).InnerXml; list = doc.GetElementsByTagName("Quantity"); int quantity = Convert.ToInt32(list.Item(0).InnerXml); // Remove the items from the inventory, if available bool rc = CheckInventory(Connection, Transaction, inventoryId, quantity); // Send a response message back to the initiator of the conversation SendCustomerReply(ReceivedMessage.Conversation, Connection, Transaction, rc); } catch (Exception ex) { ReceivedMessage.Conversation.EndWithError( 1, ex.Message, Connection, Transaction); } } private bool CheckInventory( SqlConnection Connection, SqlTransaction Transaction, string InventoryId, int Quantity)

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The output from Listing-19-5 is stored in a table called merge_Pendingchanges. You can see that the data collection set is created in Figure 19-13.

Figure 19-13. Creation of the pending changes for merge replication Initially the data collection set will be disabled. You need to enable it. Do that by rightclicking the object in the SSMS and selecting Start Data Collection Set, or by executing the sp_ syscollector_start_collection_set procedure. If you right-click the object in the SSMS after you enable it, and then select Properties, you will see a dialog like that in Figure 19-14. You can see in this dialog that the data collection set object has been created and is running. Note the retention time (14 days) and the T-SQL code in the Input parameters section. The dialog also shows that the data collection is noncached. Having enabled the data collection set, you will notice that it will take some time before you can see the resulting table in the MDW database. Be patient. The table will eventually show up as custom_snapshots.merge_Pendingchanges.

{ int realQuantity; SqlCommand cmd = new SqlCommand("SELECT Quantity FROM Inventory " + "WHERE InventoryId = @InventoryId", Connection); cmd.Transaction = Transaction; // Add InventoryId parameter SqlParameter paramInventoryId = new SqlParameter("@InventoryId", SqlDbType.NVarChar, 10); paramInventoryId.Value = InventoryId; cmd.Parameters.Add(paramInventoryId);

When setting up merge publication, the retention period is set to 14 days by default. The subscription to merge publication must be synchronized within the stipulated retention period; if it isn t, the metadata for the subscription is deactivated or dropped by the Expired subscription cleanup job. If a subscription has expired, it needs to be reinitialized, since the metadata is not there. If you do not reinitialize the subscription, the Expired subscription cleanup job, which runs every day by default, will drop any expired push subscription. For pull subscriptions, you need to manually delete the subscription. The Expired subscription cleanup job removes the metadata from the following system tables in both the Publisher and Subscriber servers: MSmerge_genhistory, MSmerge_contents, MSmerge_tombstone, MSmerge_past_partition_mappings, and MSmerge_current_partition_ mappings. If the subscription is not synchronized frequently, these tables will grow in size, and the metadata cannot be cleaned until the retention period expires.

The growth of these tables can have a negative impact on the performance of merge replication. While you can manually remove the metadata by executing the sp_ mergemetadataretentioncleanup stored procedure, you can also change the retention time period by using the @retention parameter with the sp_addmergepublication stored procedure.

SqlDataReader reader = cmd.ExecuteReader(); if (reader.Read()) { realQuantity = reader.GetInt32(0); reader.Close(); if (Quantity <= realQuantity) { SubtractFromInventory(Connection, Transaction, InventoryId, Quantity); return true; } else return false; } else { reader.Close(); return false; } } private void SubtractFromInventory( SqlConnection Connection, SqlTransaction Transaction, string InventoryId, int Quantity) { SqlCommand cmd = new SqlCommand("UPDATE Inventory SET Quantity = Quantity " + "@Quantity WHERE InventoryId = @InventoryId", Connection); cmd.Transaction = Transaction;

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