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Failover ring Each node in a server cluster runs an application, and you config ure each application to fail over to the next node. This policy is suitable for rela tively small applications, because in the event of a failure, a server might have to run two or more applications at once. In the event of multiple node failures, the application load could be unbalanced across the active nodes. For example, in a four-node cluster, if Server 1 fails, Server 2 must run its own application and that of Server 1. If Server 2 then fails, Server 3 must take on the Server 2 and Server 1 applications in addition to its own, while Server 4 continues to run only one appli cation. This makes server capacity planning difficult. Random In some cases, the best policy is for the administrator not to define any specific failover relationships at all, and let the cluster service be responsible for failing over resources to other nodes in the cluster. This policy is usually pref erable for smaller applications, so that a single node can conceivably run multiple applications if necessary. Random failovers also place less of a burden on the clus ter administrator.

10 10 10 10 10 10

Figure 10-25.

In this practice, you create a server cluster on your Server01 computer. Because you are not likely to have access to shared storage hardware that would enable you to cre ate a multinode cluster, this will be a cluster with only one server. However, the pro cess of creating a single node cluster is the same as the first step of creating a cluster with multiple nodes.

You can define very functional forms using combo boxes, tab controls, and subforms. To really make your application user-friendly, you need to further automate your forms with Visual Basic. For details about how many of the forms in the sample databases are automated with Visual Basic, see 23.

Windows Azure Table and blob storage Windows Phone 7 Client OData proxy Client ODataSync provider and runtime ADO.NET TDS protocol SQL Azure

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If your form permits updates, you can easily change or delete existing data in the underlying table or query. If the form is designed to be used in Datasheet view, you can use the same techniques you learned in 7 to work with your data. In Form view, your data might appear in one of several formats. If the form is designed to be a single form, you can see the data for only one record at a time. If the form is designed as a continuous form, you might be able to see data for more than one record at a time. As with datasheets, you must select a field in the form in order to change the data in the field. To select a field, either tab to the field or click in the field with the mouse. (Remember, if the field contains a hyperlink, clicking in it will activate the link. To edit a hyperlink, either tab to the field or right-click the field to open the shortcut menu, from which you can choose commands to edit the hyperlink.) After you select a field, you can change the data in it by using the same techniques you used for working with data in a datasheet. You can type

In this exercise, you use the Cluster Administrator to create a new server cluster on your Server01 computer.

Using Forms over individual characters, replace a sequence of characters, or copy and paste data from one field to another You might find that you can t tab to or select some fields in a form When you design a form, you can set the properties of the controls on the form so that a user can t select the control These properties prevent users from changing fields that you don t want updated, such as calculated values or fields from the one side of a query You can also set the tab order to control the sequence of field selection when you use Tab or Shift+Tab to move around on the form See 12, Customizing a Form, for details Deleting a record in a single form or in a continuous form is different from deleting a record in a datasheet.

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