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After typing your own login password, you ll be invited to define a password for the root user. Because of its power, the root user can cause a lot of accidental damage, so by default Ubuntu prevents you from logging in as root. Instead, you can switch to being the root user temporarily from an ordinary user account by using the Switch From option in the Shutdown menu. This will leave your session open while letting you open an additional session as any user (e.g., root). You will be prompted for the root password and then given root powers for as long as you need. When you ve finished, log out and return to your ordinary user account.

user: Allows a user to mount the file system. This option is normally used only for removable devices like diskettes and CD-ROMs. sync: Makes sure the content of the file system is synchronized with the medium before the device is dismounted. fs_freq: This field is for use of the dump command, which is a primitive way of making backups of your file system. The field determines which file systems need to be dumped when the dump command is called. If the value of this field is set to 0, it will not be dumped; if set to 1, it will be dumped when dump is invoked. Make sure that the value is set to 0 on all file systems that contain important data that should always be included when making backups. fs_passno: This last field in fstab determines how a file system needs to be checked with the fsck command. At boot time, the boot loader will always check if a file system has to be checked with fsck or not. If this is the case, the root file system must always be checked first and therefore has the value 1. Other file systems should have the number 2. If the file systems have the same fsck number, they will be checked sequentially. If the files are on different drives, they can be checked in parallel. If the value is set to 0, no automatic check will occur.

Listing 4-6. Using a Join to Find All Entries in Open Tournaments SELECT e.MemberID FROM Entry e INNER JOIN Tournament t ON e.TourID = t.TourID WHERE t.TourType = 'Open'

Tip You can tell when you re logged in as the root user because in the Me menu your name is root. This should be seen as a warning that you now have unrestricted control over the system, so be careful what you type, and double-check everything before pressing Enter!

When a system crashes unexpectedly, any file systems that are open can be damaged. If this happens, the consistency of these file systems needs to be checked, and you d do this with the fsck command. You can start this command with the name of the device you want to check as its argument: for example, use fsck /dev/hda1 to check files on /dev/hda1. If you run the command without any options, fsck will check the file systems in /etc/fstab serially, according to the setting in the fs_passno field in /etc/fstab. Normally, this will always happen when booting your system. Nowadays, a system administrator does not have to regularly use fsck because most modern file systems are journaling file systems. If a journaling file system gets damaged, the journal is checked and all incomplete transactions can easily be rolled back. To offer some protection regardless, an Ext2 or Ext3 file system is checked automatically every once in a while.

If you enable the root password in the name of security, it might be a sensible precaution to then disable sudo, thus preventing nonadmin users from playing with things they shouldn t. To do this, you ll need to edit the file /etc/sudoers. There will be a line (shown in Figure 21-1) that reads as follows: %admin ALL=(ALL) ALL

Comment this out with a # sign and save the file. This, of course, will all need to be done using root privileges, so use gksudo gedit in the Run Applications dialog box (accessible by pressing Alt+F2) to launch the text editor, and then navigate to and open the file. Also make sure you ve set up the root password, as shown earlier, before you do this.

The SQL statements in Listings 4-5 and 4-6 retrieve the same information. As I ve said a number of times, there are often several different ways to write a query in SQL. The more methods you are familiar with, the more likely you will be able to find a way to express a complicated query.