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Since there are no roots in the second AppDomain, the original object referred to by the proxy could be garbage collected Of course, this is not ideal On the other hand, if the original object is held in memory indefinitely, then the proxy could go away and the original object would still live; this is also not ideal The CLR solves this problem by using a lease manager When a proxy for an object is created, the CLR keeps the object alive for 5 minutes If no calls have been made through the proxy after 5 minutes, then the object is deactivated and will have its memory freed at the next garbage collection After each call into the object, the lease manager renews the object s lease so that it is guaranteed to remain in memory for another 2 minutes before being deactivated .

If an application attempts to call into an object through a proxy after the object s lease has expired, the CLR throws a SystemRuntime RemotingRemotingException It is possible to override the default lease times of 5 minutes and 2 minutes by overriding MarshalByRefObject s virtual InitializeLifetimeServices method For more information, see the section titled Lifetime Leases in the NET Framework SDK documentation ..

You can also turn this trace ag on whenever SQL Server starts by specifying -T610 as a the service startup parameter. Now, with the trace ag turned on, the following code provides the Preparation and Operation parts of this test:

At this point, it s not possible to reduce the data any further, and the summary statistics for all the survey data that the application read during the original map phase have been calculated. It s now possible to update the summary data based on survey responses received after the initial map phase ran. You process all new survey data using MapReduce and then combine the results from the new data with the old in the final step.

Many of the CLR s thread synchronization constructs are really just object-oriented class wrappers around Win32 thread synchronization constructs . After all, CLR threads are Windows threads, which means that Windows schedules and controls the synchronization of threads . Windows thread synchronization constructs have been around since 1992, and a ton of material has been written about them .4 Therefore, I give them only cursory treatment in this chapter .

A variable is something that may have a varying value over time, or even an unknown value. A variable always has a name, so you can refer to it. SQL supports two types of variables: Column name variables: The name of a column stays the same, but its value typically varies from row to row while scanning a table. System variables: These have nothing to do with tables; nevertheless, they can play an important role in SQL. They are commonly referred to as pseudo columns. See Table 2-4 for some examples of Oracle system variables.

As the rst example, the following query calculates an aggregate string concatenation over the column string for each group with a pivoting technique:

In short, the data source control is a helper class that sets up data access code with a few lines of code or in a completely codeless manner if a declarative approach is used.

The SQL*Plus COMPUTE Command ...................................................................................................... 315 The Finishing Touch: SPOOL................................................................................................................. 317

This method has changed a lot, because we now no longer only show the bit of HTML provided by the USGS, but a title with the same information as in the list view, a distance (if we can compute one), and the back button. This method starts by extracting the position of the earthquake event from the item in the model, as well as its description and title. If the location is known, a string containing the distance in kilometers and miles is computed using the Law of Haversines (http://en.wikipedia.org/wiki/Great-circle_distance), although we could have just

OrderID 11077 11076 11075 CustomerID RATTC BONAP RICSU OrderDate 1998-05-06 00:00:00.000 1998-05-06 00:00:00.000 1998-05-06 00:00:00.000

That is, if there is no implementing partial method declaration, the compiler will not emit any metadata representing the partial method . In addition, the compiler will not emit any IL instructions to call the partial method . And the compiler will not emit code that evaluates any arguments that would have been passed to the partial method . In this example, the compiler will not emit code to call the ToUpper method . The result is that there is less metadata/IL, and the runtime performance is awesome! Note Partial methods work similarly to the System.Diagnostics.ConditionalAttribute

<asp:EntityDataSource ID="EntityDataSource1" runat="server" ConnectionString="name=NorthwndEntitiesCnn" DefaultContainerName="NorthwndEntitiesCnn" EnableFlattening="False" EntitySetName="Customers" AutoPage="true" AutoSort="true OrderBy="it.CompanyName" Select="it.[CustomerID], it.[CompanyName], it.[City], it.[Region], it.[Country], it.[Phone]"> </asp:EntityDataSource>