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f the only thing you needed to learn about were Oracle database administration, your life would be so much easier. However, to ensure that your database performs efficiently, you ll also need to understand the operating system. In this chapter, you ll examine UNIX. The first part of the chapter covers the most important UNIX/Linux commands for you to know. Most of the UNIX and Linux operating system commands are identical, but I ll show you the differences where they exist. You ll learn about files and directories and how to manage them, as well as UNIX processes and how to monitor them. You ll then learn how to edit files using the vi text editor and how to write shell scripts. As an Oracle DBA, you ll need to know how to use UNIX services such as the File Transfer Protocol (FTP), which enables you to easily exchange files between computers; telnet, a program that lets you enter commands on a remote computer from a local computer; and the remote login and remote copy services. This chapter provides you with an introduction to these useful features. You ll also learn the key UNIX administrative tools for performing system backups and monitoring system performance. There s also some discussion of the basics of RAID systems and the use of the Logical Volume Manager (LVM) to manage disk systems. Toward the end of the chapter, you ll find some coverage of data storage arrays and new techniques to enhance availability and performance.
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Overview of UNIX and Linux Operating Systems
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The UNIX and Linux operating systems are similar in many ways, and users can transition easily from one to the other. From the DBA s point of view, there are few differences in commands and utilities when you migrate from one variant of the Linux/UNIX operating system to the other, since they all share common roots.
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UNIX became the leading operating system for commercial enterprises during the 1980s and 1990s. Although IBM mainframes still perform well for extremely large (multiterabyte and multipetrabyte) databases, most medium to large firms have moved to UNIX for its economy, versatility, power, and stability. IBM itself has made a successful transition to the new computer market, by dramatically reducing the size and cost of its mainframes. The IBM System z series can run Linux software and multiple virtual servers.
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CHAPTER 3 ES SEN TIAL UN IX (AN D LINUX) FOR THE ORA CLE DBA
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UNIX has a rich history, progressing through several versions before reaching its current popular place in the operating system market. I could spend quite a bit of time discussing the history and variants of the UNIX system, but I ll simplify the discussion by stating that, in reality, the particular UNIX system variant that a DBA uses doesn t make much difference. UNIX has become well known as a multitasking, multiuser system, and it is currently the most popular platform for major Oracle implementations. The most popular UNIX flavors on the market are Sun Solaris, HP-UX, and the IBM AIX versions. The basic commands don t vary much between the UNIX variants, and the different flavors mainly distinguish themselves on the basis of the utilities that come packaged with them. Contrary to what newcomers to the field might imagine, UNIX is an easy operating system to learn and use. What might put off many developers and others who were weaned on the graphical Windows framework are the terse and cryptic commands commonly associated with the UNIX operating system. Take heart, though, in the knowledge that the essential commands are limited in number, and you can become proficient in a very short time. Sun Microsystems (Sun), Hewlett-Packard (HP), and IBM sell the leading UNIX servers the machines that run each firm s variation of the Berkeley UNIX system V. IBM is also a big UNIX supplier with its AIX server. Sun and HP currently run the vast majority of UNIX-based Oracle installations.
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