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The system administrator must ensure that all required operating system patches are installed before performing the Oracle software installation. Oracle s operating system specific guides will provide you with the required and recommended patches for your operating system.

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Check that you have at least the following memory and physical space: A minimum of 1,024MB of physical random access memory (RAM). 1GB of swap space, or twice the size of the physical RAM if your RAM is between 256M and 512M. Oracle provides a matrix that shows the amount of swap space for varying RAM sizes. At least 400MB of free space in the /tmp directory. From 1.5GB to 3GB of disk space for the Oracle software, depending on the installation type. The root user should run the following two commands to check the amount of RAM and swap space: # grep MemTotal /proc/meminfo MemTotal: 1203934 kB # grep SwapTotal /proc/meminfo SwapTotal: 2040244 kB To check the available disk space, run the following command: # df -h Filesystem /dev/sda3 /dev/sda1 none Size 11G 99M 588M Used 8.7G 15M 0 Avail 1.7G 79M 588M Used% 85% 16% 0% Mounted on / /boot /dev/shm

To find out how much space you have in your /tmp directory, the system administrator can run the following command: $ df k /tmp Based on the physical disk storage requirements, the Oracle DBA will need to prepare an installation-requirements document, identifying the resources required and the preferred layout of the disks. Once the DBA s requirements pass through any necessary approvals, the system administrator will allocate the memory and disk space. The system administrator will also provide the location of all your mount points.

# Complete and process the file with the ed.script echo "w" >> $HOME/bin/$ED echo "q" >> $HOME/bin/$ED test "$DEBUG" != "" && echo DEBUG: Running ed.script for $user on $shad ed -s $shad < $HOME/bin/$ED > /dev/null

Oracle recommends a minimum of four mount points for an OFA-compatible Oracle installation. You absolutely must have at least two mount points: one for the software and the other for the database files. However, you actually need more than that for a database with several large data files. A minimum OFA-compatible installation requires four mount points: one for the Oracle software and three for the various database files. The number of mount points you need depends on your total space requirements. If your computations indicate that you need around 200GB of total space, and each of your mount points supports 7GB, you would need roughly 30 mount points for your applications. It is important that the UNIX administrator name the mount points in accordance with the OFA guidelines discussed earlier in this chapter.

The RECT structure discussed so far comes from the C-based Win32 API. If you work with C++based APIs, structures and classes can obviously be more complex. Nevertheless, everything I have discussed for C structures applies to C++ classes equally. Like C structures, C++ classes

Oracle requires huge amounts of shared memory segments, which are usually not configured by default in the Linux (or UNIX) operating system. There is a good possibility that the system administrator will need to change certain kernel parameters, such as the ones dealing with memory and semaphores (structures that control access to the operating system s memory).

It is extremely important for the kernel to be reconfigured at the outset. If enough memory resources aren t configured per Oracle s guidelines, either your installation will not succeed or you will encounter an error when you try to create a database after the installation of the Oracle software. The kernel reconfiguration is a very simple task for the administrator. All he or she has to do is change the kernel configuration file and regenerate a new kernel file using the appropriate command. The system administrator then needs to restart the system with the new kernel file replacing the older version.

Each UNIX or Linux operating system may have a different set of kernel requirements for an Oracle installation. Table 7-3 shows the kernel requirements for the Red Hat Linux 3 operating system I am using for the Oracle software installation. Table 7-3. Sample Linux Kernel Requirements for an Oracle Installation