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Figure 3-2. Kernel parameters As you can see, four parameters are passed by default to the Linux kernel. The first is ro, which means the (/) root filesystem will be mounted read-only temporarily so that the file system checker can check the root filesystem without damaging it. The second is root=LABEL=/, which tells the operating system where the (/) root partition is located. In this case, labels are being used, rather than specific device names, and the kernel will use this information to find the actual root partition on disk. The third and fourth options are for cosmetic purposes; namely, to see less text and more animation. The option rhgb is used to display the graphical boot when booting up. The quiet option limits the text messages seen while booting up. Try to remove the options by pressing Backspace until the only text visible is ro root=LABEL=/. Press Enter to make changes and to launch the operating system. You will notice that the boot messages are verbose and provide important information for system administrators to examine, as shown in Figure 3-3. If you are troubleshooting boot issues, scan the boot messages for clues.

This entity can then be represented as a single object Of course, it s possible to have your conceptual model correspond exactly to your database model you re free to create a straightforward mapping where one entity represents one row in one table Used in this way the Entity Framework, in conjunction with LINQ to Entities, makes LINQ to SQL look redundant So why do we have both The main reason LINQ to SQL exists is that it was ready when Visual Studio 2008 shipped, whereas Microsoft hadn t finished the Entity Framework at that point LINQ was a major part of that release, and since one of the main motivations behind LINQ was data access, shipping without a LINQ-based data access feature would have been a bit of a letdown.

LINQ to SQL was developed by a different team (it came from the LINQ team, and not the data access group), and it was ready earlier, due no doubt in part to its less ambitious goals Microsoft has stated that while both technologies are fully supported, the Entity Framework is where the majority of its efforts will now be focused Visual Studio 2010 adds a few new LINQ to SQL features, but LINQ to Entities will see more development in the long run That s why this chapter s focus is the Entity Framework (although a lot of the concepts here apply equally to both technologies) That being said, both authors really like LINQ to SQL.

Figure 3-3. Boot messages in text mode To add a parameter, just press the spacebar and type the options. Table 3-1 lists the options you may need to add to kernel parameters. Table 3-1. Kernel Parameters

In scenarios where we re using SQL Server and where we don t need the conceptual model and mapping features of the Entity Framework, we re both more inclined to use LINQ to SQL because of its simplicity and because we ve already learned how to use it But if you learn only one data access technology for NET, the Entity Framework looks like the better choice for the long term..

Once an external entity initiates the flow, the flow continues until an exception is encountered or the flow is completed..

By the time Microsoft shipped the Entity Framework, various third-party options for mapping relational data into object models had been around for a while. We re not going to talk about them in this book, but it s useful to be aware that the Entity Framework isn t the only game in town.

Perhaps the best known alternative is NHibernate. This is a .NET version of Hibernate, a popular Java ORM (Object Relational Mapper). NHibernate had already been around for a few years by the time the Entity Framework emerged (and its Java progenitor is considerably older). So in many respects it s a more mature and more fully featured ORM than the Entity Framework. On the other hand, NHibernate predates LINQ (and Java currently has nothing resembling LINQ), so at the time of this writing, its LINQ support is somewhat limited. Many other ORMs are available for .NET, some free and some commercial. They are too numerous to mention here, as a quick web search will confirm.

Used to boot to single-user mode, which creates a very basic environment that doesn t start any network services. This mode is used by administrators to repair the system, such as fixing a damaged configuration file or changing the root password. Has the same effect as passing the parameter single. Used to run the system in text mode with networking but without X Windows. Used to run the system in graphical mode. Used as a workaround to take control of the mouse pointer in a Virtual PC environment. Disables DMA on IDE-based drives. Used to specify the amount of RAM in MB if the system cannot automatically recognize the amount of memory. Disables the FireWire driver if booting crashes when the FireWire module is booting up. Used to disable hardware detection.