[surachart@oralearning ~]$ vncserverI ended (more...)
New 'oralearning:1 (surachart)' desktop is oralearning:1
Starting applications specified in /home/surachart/.vnc/xstartup
Log file is /home/surachart/.vnc/oralearning:1.log
In my last post about large pages in 220.127.116.11 I promised a little more background information on how large pages and NUMA are related.
Background and some history about processor architecture
For quite some time now the CPUs you get from AMD and Intel both are NUMA, (more...)
Need to quickly add the Pingdom IP’s to your CSF.allow file?
wget --quiet -O- https://my.pingdom.com/probes/feed | \ grep "pingdom:ip" | \ sed -e 's|||' >> /etc/csf/csf.allow sleep 5 csf -r
What it does:
- Fetches the latest probing server IP’s from Pingdom
- Greps the output of (more...)
Large Pages in Linux are a really interesting topic for me as I really like Linux and trying to understand how it works. Large pages can be very beneficial for systems with large SGAs and even more so for those with large SGA and lots of user sessions connected.
This is a contributed post from Mingming Cao, lead ext4 developer for the Oracle mainline Linux kernel team.
I attended the second ext4 workshop hosted at the third day of Linux Collaboration Summit 2013. Participants included Google, RedHat, SuSE, Taobao, and Lustre. We had about 2-4 hours of good (more...)
Live, Learn and Share is the signature from a friend that I used to work with – Chau Vu
Today, I learned something new because I was shared something by a colleague – Jing Han
If you know part of filename for what you are looking for but don’t know (more...)
Ever wanted your own Teamspeak 3 Server? I’ve built a script that will install a secure copy of Teamspeak 3 (64 bit) on CentOS 6.4.
Simply run the following set of commands on your CentOS 6.4 server to install a secure Teamspeak 3 voice server:
iptables -F iptables (more...)
When an Oracle process starts executing a query and needs to do a full segment scan, it needs to make a decision if it’s going to use ‘blockmode’, which is the normal way of working on non-Exadata Oracle databases, where blocks are read from disk and processed by the Oracle (more...)
This is just a very small post on how to watch the progress of the “CopyBack” state of a freshly inserted disk in an Exadata “Computing” (database) node. A disk failed in the (LSI Hardware) RAID5 set, and the hotspare disk was automatically used. The failed disk was replaced, and (more...)
Today, I downloaded Fedora 18 “Spherical Cow” and noticed that it would not boot when using VMware Fusion on Mac OSX.
It seems this issue resolves itself when disabling ’3D Acceleration’ in your VMware Guest Settings.
Disabling 3d Acceleration in VMware Fusion for Mac OSX
- Open VMware Fusion and make (more...)
But now rebooting works like expected (with Ubuntu and Windows 8).After some more reboots and trying to start ubuntu, booting ubuntu only works randomly. Sometimes it worked after walking through BIOS/UEFI. Sometime it did (more...)
So this is a little bit of a plug for myself and Enkitec but I’m running my Grid Infrastructure And Database High Availability Deep Dive Seminars again for Oracle University. This time these events are online, so no need to come to a classroom at all.
Here is the short description (more...)
Yum is a powerful repository management tool available in all Red Hat / CentOS / Fedora distributions. It allows you to install common packages immediately, removing the need to manually compile from source.
Search Packages in Yum
Searching available packages in Yum is easy, simply issue the following to search (more...)
Following the announcement that Red Hat will be discontinuing official support of Xen in EL6 in favour of KVM, I thought it’d be a good time to release a detailed how-to on installing the Xen Hypervisor on CentOS 6.x.
This article will guide you through the successful installation (more...)
To see your currently available memory, execute the following command in your terminal:
When reading the output of this command, always read the buffers / cache +- section for a true indication of available memory.
This is because Linux employs disk caching, for example, when an application is (more...)
Just completed RAC training and wanted to put into practice.
SCAN IPs MUST NOT be in the /etc/hosts file because it will result in only 1 SCAN IP for the entire cluster.
I started looking for simple DNS server to be used with RAC and came across dnsmasq.