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Creating the OSOPER Group
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The OSOPER group is optional it should be created only if you re planning to create one or more Oracle users with limited administrative privileges. Here s how you create the OSOPER group: # /usr/sbin/groupadd oper
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The OSASM Group (asmadmin)
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In order to clearly divide the responsibilities between ASM administration and database administration, Oracle 11g introduces a new SYSASM privilege. There is a new operating system group called
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CHAPTER 9 INSTALLING A ND UPGRADING TO ORA CLE DA TA BAS E 11 G
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OSASM, which you use exclusively for ASM administration. Members of the OSASM group can connect as SYSASM using operating system authentication, similar to members using the SYSDBA privilege for database administration. Create a new OSASM operating system group with the following command: # /usr/sbin/groupadd asadmin The group name in this example is asadmin.
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Verifying That an Unprivileged User Exists
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An unprivileged user called nobody is necessary to own the external jobs (extjob) executable. Before you install the Oracle software, verify that the user nobody exists in the system. If the user nobody doesn t exist, create the user by executing the following command: $ /usr/sbin/useradd -g nobody
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Creating the Oracle Software Owner User
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After the system administrator has created the necessary groups, he or she needs to create the allimportant user that owns the Oracle software, usually named oracle (you can choose any name, but oracle is used by convention). The oracle user is the owner of the Oracle software, and this user s default or primary group will be the newly created ORAINVENTORY group. You need to install Oracle software as the Oracle software owner (the oracle user), rather than as root. The oracle user s secondary group should be the OSDBA group, and if necessary, the OSOPER group as well. The oracle user will have a home directory like all the other users (usually something like /u01/app/oracle), under which you ll create the rest of the directory structure for holding the Oracle Database 11g server software.
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Caution
Don t use the root account to install or modify Oracle software. Only the oracle user should perform the Oracle software installation operations.
Under an HP-UX system, you can use the administrative tool SAM to create the users. In any UNIX or Linux system, you can create the users manually, with the following command: # /usr/sbin/useradd g oinstall G dba In the preceding command g denotes the primary group of the user oracle, which is the oinstall group. G is the secondary group, which is the dba group. d denotes the home directory for the new user. p is the password for the oracle user. You may use the following command to set the password for the oracle user, if you wish: # /usr/bin/passwd oracle Refer to 3 for more details about the passwd command. Note that the default home directory of the oracle user should be similar to that of the normal users of the system. The ORACLE_HOME directory is not meant for the oracle user; it s the location for the Oracle software binaries and similar files. d /home/oracle -p oracle1 oracle
CH A PT ER 9 I NST A LLI NG AND UP GRA DI NG T O OR ACLE DA TA BAS E 11 G
Note
The oracle user should be given read, write, and execute privileges on all files and directories that are part of the Oracle Database 11g installation.
Setting File Permissions
The next step is to set the default Linux/UNIX file permissions. To do this, the system administrator must first check the existing default permissions by issuing the umask command. If the umask is set to anything but 022, change it to 022 by issuing the umask 022 command. The system administrator can simply open the default login shell (which, for the BASH shell on Red Hat Linux, is .bash_profile) and add this line: umask 022
As you saw in 3, the default permissions for a newly created file system are 666 under the octal notation. That is, everyone is able to read and write any file. By using a default file permission of 644 (by using the umask of 022), you are granting any users other than the oracle user read permission only on the file systems. Of course, the system administrator must make sure the oracle user has write permissions to create files in all the user s directories. The UNIX administrator must ensure that a local bin directory exists, such as /user/local/bin or /opt/bin. The administrator must further ensure that this directory is included in the PATH environment variable used by the oracle user and that the oracle user has execute permission on this directory. The system administrator must also create a directory with the name /var/opt/oracle that is owned by the oracle user. This directory will contain files that describe various components of the Oracle server software installation. The following commands will create the directory and assign it the necessary privileges: $ mkdir /var/opt/oracle $ chown oracle:dba /var/opt/oracle $ chmod 755 /var/opt/oracle
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