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NI: The nice value of the process. See Setting Process Priority later in this chapter for more details on nicing processes. VIRT: This is the total amount of memory that is claimed by the process. RES: The resident memory size is the memory that the process is actually using at the moment. SHR: The amount of shared memory is what the process shares with other processes. You ll see this quite often, as processes often share libraries with other processes. S: This is the status of the process, and they re the same status indications as the ones in the second line of the top screen. %CPU: This is the amount of CPU activity that the process has caused in the last polling cycle (which is typically every 5 seconds). %MEM: This is the percentage of memory the process has used in the last polling cycle. TIME+: This indicates the total amount of CPU time that the process has used since it was first started. You can display this same value by using the time command, followed by the command that you want to measure the CPU time for. Command: This is the command that started the process. As you have seen, the top command really provides a lot of information about current system activity. Based upon this information, you can tune your system so that it works in the most optimal way.

Secure Sockets Layer; form of network data transfer designed to encrypt information for security purposes. It s used online for certain web sites and also within Linux for certain types of secure data exchange.

Although top is not the only tool that you can use for process monitoring, it s the most important. Its major benefit is that it shows you almost all you need to know about your system s current activity, but you should be aware that top itself takes up system resources as well, thus skewing the parameters that it shows. Some other good performance-monitoring tools are available as well: ps: This tool gives a list of processes. uptime: This tool shows how long the server is up and gives details about the load average as well. Basically, it displays the same output as the first line of output of the top command. free: Use this tool to show information about memory usage.

Legendary hacker who founded the GNU Project and created the concept of copyleft, as well as the software license that incorporates it: the GNU Public License (GPL). See also Linus Torvalds.

Listing 7-10. A Full Outer Join Expressed As the Union Between a Left and Right Outer Join SELECT * FROM Member LEFT JOIN Type ON MemberType = Type UNION SELECT * FROM Member RIGHT JOIN Type ON MemberType = Type

Linux and UNIX shorthand for the device usually used to provide input to the shell. For the majority of desktop PC users, this refers to the keyboard.

In your work as an administrator, you ll need to terminate misbehaving processes on a regular basis. When terminating a process, you ll send it a predefined signal. In general, the three important ones are SIGHUP, SIGKILL, and SIGTERM.

Linux and UNIX shorthand for the device usually used to display output from a command. For the majority of desktop PC users, this refers to the screen.

A word, phrase, or sentence consisting of letters, numbers, or other characters that is used within a program and is often supplied by the user.

If you take the intersection of two compatible tables, you will retrieve those rows that are found in both tables. The intersection of our two tables, ClubA and ClubB, is reproduced in Figure 7-9, and the algebra expression is in Listing 7-11.

If you send the SIGHUP signal to a process, it doesn t really terminate the process but just forces it to reread its configuration files. This is very useful to make sure that changes that you made to configuration files are applied properly. Next is SIGKILL, which is sent to a process when someone uses the infamous kill -9 <PID> command to terminate a process. In this command, the -9 is a numerical representation for the SIGKILL signal. (Check the signal(7) man page for more details about signals and their numerical representations.) The SIGKILL signal doesn t terminate a process nicely: it just cuts it off, and the results can be severe because the process doesn t have an opportunity to save open files. Therefore, SIGKILL will definitely damage any open files and possibly even lead to system instability. So use it only as a last resort. SIGTERM is the third signal that a process will always listen to. When a process receives this signal, it shuts down gracefully. It closes all open files and also tells its parent that it s gone. Using SIGTERM is the best way to terminate processes you don t need anymore.

Program that runs under UNIX and Linux by which ordinary users are temporarily afforded administrator rights. Ubuntu relies on sudo as the exclusive way for users to administer the system. The equivalent command to start GUI applications under Ubuntu is gksu.

Scalable Vector Graphics; vector graphics technology. SVG is actually an XML markup language designed to create 2D graphics, increasingly used for Linux desktop icons and web graphics.