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In general, it s not a good idea to tune the kernel on your system. The reason is simple: Ubuntu Server comes with a tuned kernel. The Ubuntu Server is a working kernel, and the entire system is built around it. If you re going to upgrade or modify that kernel, it will become more difficult to deliver support. Therefore, in all situations, make sure that you don t lose support from the party that currently supports you. The kernels that are used on Ubuntu Linux (no matter what version of the operating system you re using) are pretty close to the official Linux kernels as found on ftp.kernel.org. Ubuntu distinguishes between the Linux kernel (the so-called vanilla kernel) and the kernel that Ubuntu uses, which is installed automatically for the hardware platform that you are using. When using special software, such as XEN (see 12), an additional kernel may be installed as well. To use them, the GRUB boot menu will be automatically modified as necessary. You can create your own binary kernel from the kernel sources. This is referred to as compiling the kernel, and it s a five-step procedure: 1. Install the kernel sources for your platform. 2. Configure the kernel using a command such as make menuconfig. 3. Build the kernel and all its modules. 4. Install the new kernel.

--2 SELECT o.SalesOrderID,d.SalesOrderDetailID FROM Sales.SalesOrderHeader AS o INNER JOIN Sales.SalesOrderDetail AS d ON o.SalesOrderID = d.OrderID; Query 1, which joins the Sales.SalesOrderDetail table to Sales.SalesOrderHeader on the SalesOrderID column, performs better because there is a nonclustered index defined on the SalesOrderID column. There is not an index on the new OrderID column, so a clustered index scan is performed on the Sales.SalesOrderDetail table to join the tables in query 2. Compare the execution plans of the derived table example (Listing 4-18) and the CTE example (Listing 4-19). Explain why the query performance is the same or why one query performs better than the other. The performance of the two queries is the same. These two techniques are just different ways to do the same thing in this case.

In some situations say, if you want to build a custom kernel the kernel sources may have to be present. This is mainly the case if you need to be able to add new functionality

Sometimes the output of your application will not be intended for presentation as HTML, but will instead be generated as a PDF, a Microsoft Word document, or an XML file. In these cases, we need to resort to code to generate the contents of the view. In fact, we need to define our own view type. Spring views are just classes that implement the View interface, shown in Listing 6-33.

Use the AdventureWorks2008 database to complete this exercise. 1. Write a query to determine the number of customers in the Sales.Customer table. SELECT COUNT(*) AS CountOfCustomers FROM Sales.Customer; 2. Write a query that lists the total number of products ordered. Use the OrderQty column of the Sales.SalesOrderDetail table and the SUM function. SELECT SUM(OrderQty) AS TotalProductsOrdered FROM Sales.SalesOrderDetail; 3. Write a query to determine the price of the most expensive product ordered. Use the UnitPrice column of the Sales.SalesOrderDetail table. SELECT MAX(UnitPrice) AS MostExpensivePrice FROM Sales.SalesOrderDetail;

to the kernel, such as to compile a module for a certain piece of hardware for which you have only the source code and no compiled version. To install the kernel sources, use the following procedure: 1. Use the command apt-cache search linux-source to see a list of all kernel sources that are suitable for your server. See Listing 6-8 for an example. 2. Now, as root, use the apt-get install command to install the sources that you want to use; for instance, use apt-get install linux-source-2.6.20. If this command causes an error message, run apt-get update before you start. 3. After downloading the kernel sources, an archive file is placed in /usr/src/. Now you need to extract this file by using tar -jxvf linux-source-2.6.20.tar.bz2. This command will create a subdirectory and put the new kernel sources in it. 4. To make sure that you don t run into problems later, you now need to create a symbolic link to the directory that was just created in /usr/src. The name of this link is linux: ln -sf linux-source-2.6.20 linux. The kernel sources are now ready and waiting for you to do anything you want.

Write a query to determine the average freight amount in the Sales.SalesOrderHeader table. SELECT AVG(Freight) AS AverageFreight FROM Sales.SalesOrderHeader;

Listing 6-8. Before Installing Kernel Sources, Use apt-cache search to Find Out What Sources Are to Be Used on Your Server. root@ubuntu:/# apt-cache search linux-source xen-source-2.6.16 - Linux kernel source for version 2.6.17 with Ubuntu patches linux-source - Linux kernel source with Ubuntu patches linux-source-2.6.20 - Linux kernel source for version 2.6.20 with Ubuntu patches