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You want to make sure that the mirrored image of the data is kept separate from the primary copy of the data so that a failure of the disk that holds that primary copy will not also affect the mirrored copy To implement this protection, ASM uses the concept of a failure group When you define a disk group, you also define a failure group in relation to that disk group Mirrored data is always placed in a different failure group, which ensures that a mirrored copy of the data is separated from the primary copy of that data If a block fails or is corrupted, ASM will automatically use a mirrored copy of the data without any interruption in service You can direct ASM to actually repair bad blocks from either a command-line interface or Enterprise Manager Normally, a read request will use the primary copy of the data If the read request for that primary copy fails, ASM will automatically read the data from a mirrored copy When a read fails in this way, ASM will also create a new copy of the data, using the mirrored data as the source This approach is automatically used whenever a read request for data is executed and a bad data block is discovered You can force this type of remapping on data that has not been read by means of an ASM command Frequently, disk failures are short-lived, or transient During a transient disk failure, changes can be made to the secondary copy of the data ASM keeps track of these changes, and when the disk comes back online, performs an automatic resynchronization to make the now-available copy of the data the same as the copy of the data that was continually accessible This tracking means the resynchronization process is fast.

diagram by selecting Diagram | Set Focal Point or by clicking the Set Focal Point button on the toolbar (see Figure 15-26) That will place the selected query subject on the left side of the diagram with all of the related query subjects branching off to the right, making them easier to see while the whole diagram is showing

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There has always been overhead associated with managing storage for an Oracle database, such as determining which blocks have free space ASM takes care of all of these issues, removing them from the DBA workload In fact, ASM manages much more than these basic tasks The striping and mirroring discussed in the previous sections is done automatically within a disk group You can also dynamically resize a disk group by adding more disks to the group, or take disks out of a disk group Both of these operations can be performed without any downtime If you add new disks to a disk group, ASM will rebalance data across the new disks ASM does an intelligent rebalance, only moving the amount of data necessary to ensure an even balance across the new set of disks, and rebalancing is done, by default,

FIGURE 15-28

Now let's put these statements together to create an ASPNET web page that accesses the customer database We'll show two examples The first is for Microsoft SQL Server, and the second is for Microsoft Access Notice that the connection to the database is made in the Page-Load subroutine Each time the page is loaded, the ASPNET engine establishes a connection with the database

Another way to focus the diagram on an area you want to see is to use the Navigation pane When you click the Navigate button in the lower-right corner of the Diagram view, the Navigation pane appears, as shown in Figure 15-29 Within the Navigation pane is the visible area indicator, which shows the part of the diagram that is visible in the Project window You can drag the indicator around the Navigation pane to change the visible part of the diagram In versions prior to 83, the button works on a drag-and-drop principle: click the button to bring up the Navigator, but keep the mouse-button pressed while you drag around the visible indicator before releasing the button

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Import Namespace="SystemDataSqlClient~ % > <Script Runat="Servern> Sub Page-Load Dim custDb As SqlConnection custDb = New SqlConnection(~Server=localhost;uid=myID;pwd=m~assword; database=customeru) custDb Open ( ) End Sub </Script>

FIGURE 15-29

asynchronously, so as to not impact online performance ASM includes a parameter that gives you the ability to control the speed of rebalancing, which, in turn, has an impact on the overhead used by the operation Since ASM manages most administrative details within a disk group, you would normally create a small number of disk groups In fact, Oracle recommends creating only two disk groups one for data and the other for the Flash Recovery Area used to hold database backups ASM itself can be managed through SQL*Plus, Enterprise Manager, or a command-line interface

A third way to make it easier to see your related tables is to use the Context Explorer, which focuses on selected query subjects and the query subjects to which they are related, as shown in Figure 15-30 Right-click the query subject or CTRL-click multiple query subjects and then right-click and choose Launch Context Explorer The Context Explorer functions like a small-scale Diagram view, so you can double-click a query subject or relationship link to bring up the respective definition dialog The Context Explorer has toolbar options to show query subjects that are related to or referenced by the query subject selected

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