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If you find that prelinking makes a particular application malfunction or simply stop working, you can try undoing prelinking. To do this, find out where the main binary for the program resides and issue the prelink command with the --undo command option. For example, to remove prelinking from the Gedit text editor program, you could type the following: whereis gedit This command will show that the gedit binary is found at the location /usr/bin/gedit in the file system. Next, attempt to undo prelinking on the binary: sudo prelink --undo /usr/bin/gedit However, this may not work, because some programs might rely on additional binaries on the system. Therefore, the solution might be to undo prelinking for the entire system, which you can do by typing the following: sudo prelink -ua After this, you should remove the prelink package, via the Ubuntu Software Center, to stop it from running again in the future (or manually remove its cron entry).

Caution Prelinking is dangerous, as services and programs may stop working if you use it. If it works, your computer will be faster. But be prepared to do some additional manual work to undo prelinking for some of the programs on your computer.

Note An extent is a group of blocks. Working with extents speeds up administration and file handling on

Listing 4-15. SQL Statement to Retrieve Members with Handicaps Less Than the Average SELECT * FROM Member m WHERE m.Handicap < (SELECT AVG(Handicap) FROM Member)

You can download the Linux kernel source code and compile your own version of it This gives you total control over the kernel configuration, so you can leave out parts you don t want in order to free memory On current kernels however, you won t often need to compile your own kernel The Linux kernel is modular; so it just won t load components that are not going to be needed But still, you can compile your kernel to leave out certain components completely By recompiling, you can also set certain optimization settings, such as creating a version of the kernel specifically built for your model of CPU On the other hand, the mere fact of recompiling your kernel allows you to learn a lot about the way it works.

So even if it s not really useful for better performance, it may give you a better understanding of the way Linux works Although compiling a kernel is a simple procedure, you ll need to answer many complex questions and have an in-depth knowledge of the way Linux works You could also have a model of a working kernel to crib from, which is a great way to avoid some growing pains while teasing out optimal kernel compilation settings In addition, compiling your own kernel brings with it several issues The first is that it may not work with any binary modules that you have installed, such as graphics cards or wireless drivers You can opt to update these yourself, but this adds to the complexity The second problem is that Ubuntu is built around precompiled kernels.

file systems that work with large files. Also, because every file is initially written to its own extent, working with extents prevents fragmentation of your file system.

Several software packages expect to work with the precompiled kernel, and in addition, Ubuntu may occasionally download an updated prepackaged kernel automatically as part of the system update feature and override the one you ve created If there are any security problems with the kernel version you compiled, you ll need to recompile a new kernel from scratch (or patch the one you have) This means you ll have to keep an eye on the security news sites and take action when necessary Your customized kernel may also fail to automatically detect newly supported hardware, meaning you ll have to acquire and load the drivers manually That said, compiling a kernel is an excellent way of learning how Linux works, and if it all goes well, the sense of achievement is enormous Some people choose to download the kernel source code from the official Linux kernel site, wwwkernelorg.

If you take it nice and slowly, you can gradually build up quite complicated queries. Say we want to see whether any junior members have a lower handicap than the average for seniors. The inner query has to return the average value handicap for a senior member, and then we want to select all juniors with a handicap less than that. Both the inner and outer queries have an extra select condition (the inner retrieves just seniors, and the outer retrieves just juniors). Listing 4-16 shows one way of doing this.