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We can also update several records at a time; for example, we could update some aspect of all the senior members by changing the WHERE clause in Listing 4-20. In 1 we also looked at inserting and deleting rows from a table. Listing 4-21 shows a simple example of inserting a row into the Entry table. We list the columns we are providing values for and then the values.

If you understand the role of pv, vg, and lv, the rest is peanuts. All relevant commands start with Tip

If the worst happens, and you need to restore any number of files from the backup, you can click System Administration Simple Backup Restore. The first step is to select the location of the backup directories. If the backups aren t contained in /var/backup, click Use custom and either type the path into the field or click the file browser button and locate the backup directories and click Apply. Then click the Available Backups drop-down list to choose a backup directory from which to restore. The directory names contain the dates and times the backups were made, and it makes sense to choose the latest (unless you want to revert to an older version). After the backup has been selected, the files that the backup archive contains are displayed. Each directory has a small triangle to its left, which you can click to expand the directory and show its contents. After you ve found the file(s) or directories you want to restore, highlight them and click the Restore button. But beware, because this will rewrite the files and directories to their original locations files or directories already there with matching filenames will be overwritten! If you want to restore the files to a different location, click the Restore As button and then choose a folder. Simple Backup stores its information in a standard .tar.gz file within the selected directory when you back up. This means it s possible, if necessary, to manually access the information in the backup.

Caution Restored files and directories are owned by root. This is because Simple Backup runs with superuser powers. Therefore, one of the first things you have to do is to change the ownership and group of the file to what they were originally. See 21 for more details about file ownership and how to change it.

either pv, vg, or lv and are followed by the specific task you want to perform. For example, if you want to create a pv, a vg, or an lv, use pvcreate, vgcreate, or lvcreate. If you want to extend them, use vgextend or lvextend (a pv cannot be extended). You want to show the current setup Display it with pvdisplay, vgdisplay, or lvdisplay. Some more commands are involved, and a good way of getting to know them all is to type the first two letters of the command that you are interested in at the Bash prompt, for example vg. Then, press the Tab key twice. The automatic command-completion feature displays a list of all commands that start with vg , which makes it rather easy to pick the right one.

Listing 4-21. Inserting a Row into the Entry Table INSERT INTO Entry (MemberID, TourID, Year) VALUES (153, 25, 2007)

Although Simple Backup allows the uninitiated to make quick and regular backups, there are many other ways to package a folder and store it as a single file. Linux users often create archives in the form of .tar files. tar stands for Tape ARchive and refers to backing up data to a magnetic tape backup drive. Originally designed for backing up files with UNIX operating systems, it has also become a standard method of transferring files across the Internet, particularly with regard to source files or other installation programs.

Note Linux comes with a couple more backup commands, which you might choose to use. They are cpio and pax. Both aim to improve on tar in various ways, but neither is broadly supported at the moment. cpio is installed by default under Ubuntu, and pax can be found via the Ubuntu Software Center. Examine their man pages for more details.