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You might want to make one refinement: once the modifications are complete, you could check the line counts of the passwd and shadow files to see whether they match. If they don t match, it is possible that an account has been removed and the account is not present in the passwd file; the entry is still visible in the shadow file, though. The script should then remove the old usernames from the shadow file to keep both files synchronized.

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To view the current kernel configuration, issue this command: $ cat /etc/sysctl.conf During the operating system prerequisite checks, the Oracle installer might show errors that can be fixed by reconfiguring the UNIX or Linux kernel. If the kernel needs reconfiguring, the system administrator will need to add the following lines to the kernel configuration file: kernel.shmall = 2097152 kernel.shmmax = 2147483648 /*or half the size of physical memory, in bytes kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 fs.file-max = 65536 net.ipv4.ip_local_port_range = 1024 65000 On my Linux server, I modified the /etc/sysctl.conf file, but this may vary depending on your OS. After reconfiguring the kernel parameter settings and generating a new kernel, the system administrator must reboot the system using the new kernel for the new settings to take effect. The system administrator can also use the following command on Red Hat Linux to dynamically change the current values of the kernel parameters, without a need to reboot the system (this will only change the values temporarily and they ll revert to their original values upon rebooting): # /sbin/sysctl p

After the kernel parameters have been changed, the system administrator can verify the settings by running the following commands as root: /sbin/sysctl /sbin/sysctl /sbin/sysctl /sbin/sysctl -a -a -a -a | | | | grep grep grep grep shm sem file-max ip_local_port_range

Oracle uses the shared memory segments of the operating system to share data among its various processes.

define the binary layout of instances For access to data members of C++ classes, ldind and stind instructions are used in the same way as they re used for C structures However, C++ gives the programmer further features to define types; C++ classes can also have functions, including special member functions and virtual functions The details of calling member functions across interoperability boundaries are discussed in 9 In this chapter, I will discuss how managed code can be used to determine the target of a virtual function call (the address of the most derived virtual function) at runtime When a native class contains or inherits virtual functions, it will have one or more vtable pointers in the instance data (The number of vtable pointers depends on the base classes.

In addition to modifying the kernel parameters, the system administrator must also check limits on user processes as well as certain user login shell scripts, and change them if necessary. The following sections discuss these additional changes to be made by the system administrator.

uilding a system manually can be fun Building many systems manually is tedious and prone to error, especially when all systems should be built in exactly the same way For this reason, Kickstart by Red Hat, Jumpstart by Sun, and other utilities were created to automate a network-based system build that is based on preset parameters These utilities work well when you are building new systems on a regular basis The downside of this method is that a client is required to be on the network and it needs to have access to the server to do a system build Also, a build server needs to be set up and maintained, but if you are building only a moderate number of systems, it may not be worth the extra effort to set up a build server.

Oracle recommends setting limits on the number of processes and open files each Linux account may use. To improve the performance of Oracle software on Linux systems, the system administrator must increase certain shell limits for the oracle user by adding the following lines to the /etc/ security/limits.conf file: oracle oracle oracle oracle soft hard soft hard nproc nproc nofile nofile 2047 16384 1024 65536

You must also add the following line to the /etc/pam.d/login file: session required /lib/security/pam_limits.so