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Developed by Linus Torvalds, Linux is constantly under development because it is released under an open source license and is freely available for download from the Internet. Many users prefer to use Linux because more programs and drivers are available, it s free (or close to free, as the commercial versions are fairly cheap), and bug fixes are released very quickly. Oracle Database 11g was developed on the Linux platform, and that s why the Linux-based version was the first to be released for production use. Oracle has certified and supports Red Hat Enterprise Linux AS and ES (either the 4.0 or the 5.0 version), SUSE LINUX Enterprise Server 10, Asianux 2 and 3, and the Enterprise Linux, versions 4 and 5.
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Note I used a Linux 4.0 distribution from Red Hat to run Oracle Database 11g on my Windows XP desktop for the purposes of this book. I used the VMware virtual operating system tool (http://www.vmware.com) to run the Linux operating system alongside Windows.
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Oracle was the first company to offer a commercially available database for the Linux operating system. Oracle even offers a full suite of clusterware for Linux, which makes it possible to use Oracle s Real Application Clusters (RAC) on Linux without the more costly and complex raw file systems. Do all these moves toward the Linux operating system foreshadow the demise of the UNIX operating system Although the market for UNIX systems has dropped in recent years, you have to interpret this fact cautiously; most of the movement toward the Linux operating system is intended for lowend machines that serve network and other desktop applications. For the foreseeable future, UNIXbased systems will continue to rule the roost when it comes to large, company-wide servers that run large and complex databases such as Oracle Database 11g. IT organizations are moving to Linux and open source software to solve a wide variety of business problems. The Linux platform often plays the central role in establishing a low-cost computing infrastructure. Oracle s grid initiative relies on using massive numbers of cheap commodity servers based on the Linux platform. Although Linux is growing very fast as a viable operating system for Oracle databases, the consensus among the IT industry is still that Linux is mainly useful for services, and not for mission-critical databases. This leaves UNIX and Windows as the two leading operating systems for Oracle databases. Oracle provides support to the Linux community by offering code for
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CH APT ER 3 ES SEN TI AL UN IX (A ND LINU X) F O R TH E O RA CLE D BA
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key products and itself uses the Linux platform extensively. Oracle s suite of clusterware links a number of separate servers into a single system, and low-cost Linux servers are an inexpensive choice for these file systems.
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Just a few years ago, you had to invest in behemoths like the Sun E10K, with its hard partitions and multiple processors, if you wanted a system to support heavy workloads. Today, much smaller midrange UNIX servers come with features like soft partitioning, high amounts of memory, hotspare processors, and capacity-on-demand features that were once the exclusive preserve of the high-end systems. The main competition among the midrange servers is between Intel-based servers and RISCbased (reduced instructor set computer based) servers using the UNIX or the Linux operating systems. The choice of the particular operating system will depend on the workload you plan on supporting as well as on the availability, reliability, and response time requirements. The rest of the chapter, while formally oriented toward UNIX-based systems, applies almost verbatim to any Linux-based operating system as well.
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Understanding the UNIX Shell(s)
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In UNIX systems, any commands you issue to the operating system are passed through a command interpreter layer around the kernel called the shell. When you initially log in, you are communicating with this shell. The kernel is the part of UNIX that actually interacts with the hardware to complete tasks such as writing data to disk or printing to a printer. The shell translates your simple commands into a form the kernel can understand and returns the results to you. Therefore, any commands you issue as a user are shell commands, and any scripts (small programs of grouped commands) that you write are shell scripts. The UNIX shell has many variants, but they are fundamentally the same, and you can easily migrate from one to another. Here s a list of the main UNIX and Linux shell commands and the shells they run: sh: The Bourne shell, which was written by Steven Bourne. It is the original UNIX shell, and is quite simple in the range of its features. csh: The C shell, which uses syntax somewhat similar to the C programming language. It contains advanced job control, aliasing, and file-naming features. ksh: The Korn shell, which is considered a superset of the Bourne shell. It adds several sophisticated capabilities to the basic Bourne shell. bash: The Bourne Again Shell, which includes features of both the Bourne and the C shell. For the sake of consistency, I use the Korn shell throughout this book, although I show a couple of important C shell variations. Most UNIX systems can run several shells; that is, you can choose to run your session or your programs in a particular shell, and you can easily switch among the shells. The Linux default shell is BASH, the Bourne Again Shell, which includes features of the Bourne shell as well as the Korn, C, and TCSH shells.
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Note Most of the basic commands I discuss in the following sections are the same in all the shells, but some commands may not work, or may work differently, in different shells. You need to remember this when you switch among shells.
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