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If you still need disk space, consider uninstalling unused programs. As you ve learned, you can manage software through the Ubuntu Software Center. To remove a package, search for it in the Installed Software section and click the Remove button. However, it s not a good idea to simply scroll down the list and remove anything that seems dispensable. As always, removing software can create dependency problems, so you might find yourself limited in what software you can actually remove. It s also worth periodically issuing the sudo apt-get autoremove command, which will remove any unused dependency packages on the system. Theoretically, these will always be removed provided aptget autoremove is used when specifying packages to uninstall, but the way Ubuntu is updated might mean that a handful of unused dependencies hang around after they re no longer needed. If you find you re adding and removing lots of software, you might find an application such as BleachBit (http://bleachbit.sourceforge.net/) quite useful. This can remove clutter that takes up space and could contain private information that would be best cleared away. You can download BleachBit through the Synaptic Package Manager, and it will appear under the Applications System Tools menu. You can run the software either as a normal user (which makes it harder to mess things up), or as root. To use it, simply scroll down the list and select the parts you d like to remove (for instance, the cookies from Firefox), and then click the Delete button. Clicking the Preview button will give you a good idea of what is going to be removed and the amount of space it s likely to save.

Ext4: As you can probably guess from its name, Ext4 is the next generation of the Ext file systems At the time of this writing, the first code was just available and it was far from being a usable file system By the time you are reading this, Ext4 is probably already offered as a choice when installing your server Ext4 is supposed to address all the shortcomings in Ext2 and Ext3, and it probably will be presented as an installation option, so there is no harm in using it for all your needs FAT: FAT, vfat, and NTFS file systems allow you to create a multiboot environment for a computer on which both Windows and Linux are installed The purpose of these file systems is to access files stored in Windows partitions You don t need them on a Linux-only server..

Summary

Another type of inner query is the one we saw working with the EXISTS keyword. A statement using EXISTS just looks to see whether any rows at all are returned by the inner query. The actual values or number of rows returned are not important. Listing 4-18 returns any rows from the Member table where we can find a matching row (with the same value for MemberID) in the Entry table.

In this chapter, you looked at streamlining your installation of Ubuntu. This involves speeding up the boot procedure by running boot scripts in parallel, and decreasing the boot menu delay, along with a handful of other tricks. You also looked at optimizing your hard disk settings to allow for greater speed when loading and saving files. Additionally, we discussed prelinking programs so that they load faster, recompiling the kernel so that it s optimized for your system, and freeing disk space by various means. In the next chapter, you learn how to perform backups to safeguard your data.

Now that you know some more about the choices that are offered when installing Ubuntu Server, let s continue. You now have to specify how you want to partition your server s hard disk. Because the partitioning of a hard disk is one of the most important parts of the server installation process, we will cover all three choices. Guided - use entire disk: This is the easiest option. It offers a guided installation of your hard disk, based on traditional partitions. Guided - use entire disk and set up LVM: This configuration option is a bit more complex. It offers you a wizard that allows you to create an LVM-based disk configuration. Manual: Use this procedure if you re sure you know what you are doing and you don t need the help of any wizard.

Every computer user knows that backing up data is vital. This is usually because every computer user has lost data at some point, perhaps because of a corrupted file or an accidental deletion. Some of the people behind UNIX were highly aware of such occurrences, and built in several advanced and useful backup tools. These have been mirrored within Linux, with the result that creating and maintaining backups is easy. In this chapter, you first look at what data should be backed up and then explore two ways to make backups: via the Simple Backup utility and the command line.