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The video camera that was originally focused on the presenter would then incorrectly focus on the person passing in front of the video camera Switching to manual focus can correct this problem Manual focus turns off the sensor, and then you can manually adjust the focus so that the correct object or person will be in focus for the video you record However, switching off this automatic feature means that.

You will see a single seek operation within the clustered index to fetch the anchor row, followed by an ordered scan within the covering index to fetch the next page of rows. That's not a very efficient plan. Ideally, the optimizer would have performed a seek within the covering index to the first row from the desired page of orders; then it would have followed with a partial ordered scan to grab the rest of the rows in the desired page of orders, physically accessing only the relevant rows. The

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Subscribers can use one of the Subscribe method overloads available on the CompositePresentationEvent class to subscribe to an event. There are several ways to subscribe to CompositePresentationEvents. Use the following criteria to help determine which option best suits your needs: If you need to be able to update UI elements when an event is received, subscribe to receive the event on the UI thread. If you need to filter an event, provide a filter delegate when subscribing. If you have performance concerns with events, consider using strongly referenced delegates when subscribing and then manually unsubscribe from the Composite PresentationEvent. If none of the preceding is applicable, use a default subscription. The following sections describe these options.

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reason for getting an inefficient plan is because the filter has an OR operator between the expression O.OrderDate > A.OrderDate, and the expression O.OrderDate = A.OrderDate AND O.OrderID > A.OrderID. See the sidebar "Logical Transformations" for details about OR optimization vs. AND optimization. Following the sidebar, I'll provide the optimized implementation of the stored procedure using AND logic.

In several solutions I've presented, I used logical expressions with an OR operator to deal with precedence based on multiple attributes Such was the case in the recent solutions for paging, matching current and previous occurrences, and other problems I used OR logic because this is how human minds are accustomed to thinking The logical expressions using OR logic are fairly intuitive for the purpose of determining precedence and identifying rows that follow a certain anchor However, because of the way SQL Server's optimizer works, OR logic is problematic in terms of performance, especially when some of the filtered columns are not indexed Consider for example a filter such as col1 = 5 OR col2 = 10 If you have individual indexes on col1 and col2, the optimizer can filter the rows in each index and then perform an index intersection between the two.

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However, if you have an index on only one of the columns, even when the filter is very selective, the index is useless SQL Server would still need to scan the whole table to see whether rows that didn't match the first filter qualify for the second condition On the other hand, AND logic has much better performance potential With each expression, you narrow down the result set Rows filtered by one index are already a superset of the rows you'll end up returning So an index on any of the filtered columns can potentially be used to advantage Whether or not it is worthwhile to use the existing index is a matter of selectivity, but the potential is there For example, consider the filter col1 = 5 AND col2 = 10 The optimal index here is a composite one created on both columns.

Subscribing on the UI Thread Frequently, subscribers will need to update UI elements in response to events. In WPF and Silverlight, only a UI thread can update UI elements. By default, the subscriber receives the event on the publisher s thread. If the publisher sends the event from the UI thread, the subscriber can update the UI. However, if the publisher s thread is a background thread, the subscriber may be unable to directly update UI elements. In this case, the subscriber would need to use the Dispatcher class to schedule the updates on the UI thread. The CompositePresentationEvent provided with the Prism Library can assist by allowing the subscriber to automatically receive the event on the UI thread. The subscriber indicates this during subscription, as shown in the following code example.

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