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Either approach works, but the <Serializable()> attribute is often better for this scenario because it uses an opt-out approach. All fields of the object are serialized unless you explicitly prevent the serialization. The DataContract approach is opt-in, so you must remember to mark every field for serialization. Forget one, and you ve just introduced a hard-to-find bug. Again, the .NET Framework takes care of the details, so an object of this type can be simply passed as a parameter to a method call or as the return value from a function. The object will be copied from the original machine to the machine where the method is running. It is important to understand that the code for the object isn t moved across the network automatically. Before an object can move from machine to machine, both machines must have the .NET assembly containing the object s code installed. Only the object s serialized data is moved across the network by .NET. Installing the required assemblies is often handled by ClickOnce or other .NET deployment technologies.

both, whereas others only use PCTFREE, and even then only when the object is created. IOTs use PCTFREE upon creation to set aside space in the table for future updates, but do not use PCTFREE to decide when to stop inserting rows into a given block, for example.

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The exact effect of these two parameters varies depending on whether you are using ASSM or MSSM tablespaces. When you are using MSSM, these parameter settings control when the block will be put on and taken off the FREELIST. If you are using the default values for PCTFREE (10) and PCTUSED (40), then a block will remain on the FREELIST until it is 90 percent full (10 percent free space). Once it hits 90 percent, it will be taken off the FREELIST and remain off the FREELIST until the free space on the block exceeds 60 percent of the block. When you are using ASSM, PCTFREE still limits if a new row may be inserted into a block, but it does not control whether a block is on a FREELIST or not, as ASSM does not use FREELISTs at all. In ASSM, PCTUSED is simply ignored. There are three settings for PCTFREE: too high, too low, and just about right. If you set PCTFREE for blocks too high, you will waste space. If you set PCTFREE to 50 percent and you never update the data, you have just wasted 50 percent of every block. On another table, however, 50 percent may be very reasonable. If the rows start out small and tend to double in size, setting PCTFREE too small will cause row migration as you update the rows.

CHAPTER 2 NETWORK ADMINISTRATION AND IT TRENDS THROUGHOUT HISTORY!

The .NET Framework supports all the mechanisms just discussed, so you can choose to create your objects as local, anchored, or mobile, depending on the requirements of your design. As you might guess, there are good reasons for each approach. WPF, Windows Forms, and ASP.NET objects are all local they re inaccessible from outside the processes in which they were created. The assumption is that other applications shouldn t be allowed to just reach into your program and manipulate your interface objects. Anchored objects are important because they will always run on a specific machine. If you write an object that interacts with a database, you ll want to ensure that the object will always run on a machine that has access to the database. Because of this, anchored objects are typically used on application servers. Many business objects, on the other hand, will be more useful if they can move from the application server to a client or web server, as needed. By creating business objects as mobile objects, you can pass smart data from machine to machine, thereby reusing your business logic anywhere the business data is sent. Typically, anchored and mobile objects are used in concert. Later in the book, I ll show how to use an anchored object on the application server to ensure that specific methods are run on that server. Then mobile objects will be passed as parameters to those methods, which will cause those mobile objects to move from the client to the server. Some of the anchored server-side methods will return mobile objects as results, in which case the mobile object will move from the server back to the client.

What is row migration Row migration is when a row is forced to leave the block it was created on because it grew too large to fit on that block with the rest of the rows. To illustrate row migration, we start with a block that looks like Figure 10-3.

Figure 10-3. Data block before update Approximately one-seventh of the block is free space. However, we would like to more than double the amount of space used by row 4 via an UPDATE (it currently consumes one-seventh of the block). In this case, even if Oracle coalesced the space on the block as shown in Figure 10-4, there is still insufficient room to double the size of row 4, because the size of the free space is less than the current size of row 4.

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