Oracle Linux 6 Implementation Essentials

ULN is a comprehensive resource for Oracle Linux support subscribers, and offers access to Linux software patches, updates and fixes.

A: Oracle Clusterware is software that enables servers to operate together as if they are one server. Each server looks like any standalone server. However, each server has additional processes that communicate with each other so the separate servers appear as if they are one server to applications and end users.

C: Oracle Linux support customers at the Basic and Premier support levels can download and deploy Oracle Clusterware at no additional license fee or support cost.

Incorrect:
Not D: Oracle ClusterWare services are available for Unix, Linux, and Windows.

The '1' in "/proc/sys/net/ipv4/ip_forward" enables IP forwarding.

A '0' signifies IP forwarding is disabled.

The Oracle public yum server offers a free and convenient way to install the latest Oracle Linux packages as well as packages from the Oracle VM installation media via a yum client.

You can download the full Oracle Linux and Oracle VM installation media via edelivery.oracle.com/linux.

Note:
Getting Started

1. Download and Install Oracle Linux 2. Download and copy the appropriate yum configuration file in place, by running the following commands as root:
Oracle Linux 4, Update 6 or Newer

# cd /etc/yum.repos.d
# mv Oracle-Base.repo Oracle-Base.repo.disabled
# wget http://public-yum.oracle.com/public-yum-el4.repo Oracle Linux 5

# cd /etc/yum.repos.d
# wget http://public-yum.oracle.com/public-yum-el5.repo Oracle Linux 6

# cd /etc/yum.repos.d
# wget http://public-yum.oracle.com/public-yum-ol6.repo Oracle VM 2

# cd /etc/yum.repos.d
# wget
http://public-yum.oracle.com/public-yum-ovm2.repo

3. Enable the appropriate repository by editing the yum configuration file

Open the yum configuration file in a text editor Locate the section in the file for the repository you plan to update from, e.g. [el4_u6_base] Change enabled=0 to enabled=1 4. Begin using yum, for example:

yum list

yum install firefox

You may be prompted to confirm the import of the Oracle OSS Group GPG key.

A: How does the disk heartbeat work?
Every node writes every two secs to its block in the heartbeat system file. The block offset is equal to its global node number. So node 0 writes to the first block, node 1 to the second, etc. All the nodes also read the heartbeat sysfile every two secs. As long as the timestamp is changing, that node is deemed alive.

* The command rpm -q --changelog rpm displays a detailed list of information (updates, configuration, modifications, etc.) about a specific package. This example shows information about the package rpm.
However, only the last five change entries in the RPM database are listed. All entries (dating back the last two years) are included in the package itself. This query only works if CD 1 is mounted at /media/cdrom:

rpm -qp --changelog /media/cdrom/suse/i586/rpm-3*.rpm

* Is the patch RPM suitable for my system?

To check this, first query the installed version of the package. For pine, this can be done with rpm -q pine
pine-4.44-188

Incorrect:
not C:

* qa stands for "Query All"
Assuming you are attempting to find out if you have the Very Secure FTP Daemon installed, you want:
rpm -qa | grep vsftp
rpm -qa will show you all installed RPMs, piping it through grep will limit the list to RPMs containing the string "vsftp".

In order to install the Oracle Database 11g R2 on Oracle Linux 6, your system needs to meet a few prerequisites, as outlined in the Linux Installation Guides. Using the Oracle RDBMS Server 11gR2 Pre-install RPM, you can complete most of the pre-installation configuration tasks.

The package:

* (A) Causes the download and installation of various software packages and specific versions needed for database installation, with package dependencies resolved via yum
* (C) Creates the user oracle and the groups oinstall and dba, which are the defaults used during database
installation
* (D) Modifies kernel parameters in /etc/sysctl.conf to change settings for shared memory, semaphores, the maximum number of file descriptors, and so on
* (D) Sets hard and soft shell resource limits in /etc/security/limits.conf, such as the number of open files, the number of processes, and stack size to the minimum required based on the Oracle Database 11g
Release 2 Server installation requirements
* Sets numa=off in the kernel boot parameters for x86_64 machines

The Name Service Switch (NSS) configuration file, /etc/nsswitch.conf, is used by the GNU C Library to determine the sources from which to obtain name-service information in a range of categories, and in what order. Each category of information is identified by a database name. The file is plain ASCII text, with columns separated by spaces or tab characters. The first column specifies the database name. The remaining columns describe the order of sources to query and a limited set of actions that can be performed by lookup result.

Incorrect:
Not A: In most Unix-like operating systems and others that implement the BIND Domain Name System (DNS) resolver library, the resolv.conf configuration file contains information that Not D: /etc/yp.conf - NIS binding configuration file

References:
nsswitch.conf

Execute a cron job every 5 Hours

The second field is for hours. If you specify * in this field, it runs every hour. If you specify */5 in the 2nd field, it runs every 5 hours as shown below.

0 */5 * * * /home/ramesh/backup.sh

Network bonding refers to the combination of network interfaces on one host for redundancy and/or increased throughput.