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All about RAC and MTU with a video

Let’s first discuss how RAC traffic works before continuing. Environment for the discussion is: 2 node cluster with 8K database block size, UDP protocol is used for cache fusion. (BTW, UDP and RDS protocols are supported in UNIX platform; whereas Windows uses TCP protocol).

UDP protocol, fragmentation, and assembly

UDP Protocol is an higher level protocol stack, and it is implemented over IP Protocol ( UDP/IP). Cache Fusion uses UDP protocol to send packets over the wire (Exadata uses RDS protocol though).

Oracle Database Appliance (ODA) Patch Bundle 2.1.0.3.0 Fixes CPU Performance Issue

If you are using Oracle Database Appliance (ODA) then this patch is very important to apply. The patch bundle 2.1.0.3.0 has been published just this week and the most important fix from my perspective is the new BIOS version 12010304. Intel CPUs have a feature called Software Controlled Clock Modulation that allows programmatically control of [...]

Video: deep review of LMS

This video was created circa July 2011. Click the Read More link to review the video. Version Oracle Database 11.2.0.2

Synopsis: Essentially, we probe the importance of LMS processes using DTrace. Explain why LMS should run in elevated priority. How to review deep statistics about LMS processes and much more.

Backups are forever

You should save this link in your bookmarks, for the next time you accidentally remove your database’s online redologs or overwrite some ASM disks:

 

Oracle Troubleshooting TV Show: Season 1, Episode 01 ;-)

Ok, it’s official – the first and only Oracle Troubleshooting TV show is live now!

The first show is almost 2 hours about the ORA-4031 errors and shared pool hacking. It’s a recording of the US/EMEA timezone online hacking session I did some days ago.

There are a couple of things to note:

  1. The text still isn’t as sharp as in the original recording, but it’s much better than in my previous upload attempts and is decently readable. I’ll try some more variations with my next shows so I hope the text quality will get better! Or maybe I should just switch to GUI tools or powerpoint slides? ;-)
  2. You probably should view this video in full screen (otherwise the text will be tiny and unreadable)
  3. There’s advertising in the beginning (and maybe end) of this show! I’ll see how much money I’ll make out of this – maybe these shows start contributing towards the awesome beer selection I’ll have in my fridge some day (right now I have none). Viewing a 30-sec advert is small price to pay for 2 hours of kick-ass shared pool hacking content !!!
  4. You can download the scripts and tools used in the demos from http://tech.e2sn.com/oracle-scripts-and-tools/
  5. Make sure you check out my online Oracle troubleshooting seminars too (this April and May already)

View the embedded video below or go to my official Oracle Troubleshooting TV show channel:

http://tanelpoder.blip.tv

Enjoy!

The Thing (I Don't Like) About Video

Video is awesome. I like high-bandwidth communication. Even on the cheapest, most un-produced videos, I can see facial expressions and body language that I'd never be able to pick up from text. I can see candidness that's not going to come through in a document, even a blog that's written pretty much off the cuff. And videos with high production value, ...well of course it's awesome to watch a great short movie right at the tips of your fingers.

But...

But when you send me a 7:48 video, I have to budget 7:48 to watch it. (Well, more actually, because of the latency required to buffer it up.) When you send me a 13-page document, I can "read" it in 10 seconds if I want to. I can skim the first and final paragraphs really quickly and look for pictures or sidebars or quotes, and it takes practically no time for me to do it.

With a video, it's just more difficult to do that. I can watch the first 10 seconds and usually know whether I want to watch the remainder. But skimming through the whole video—like skipping to the end—is more difficult, because I have to sit there un-utilized while the whole video buffers up. Then I have to sit there while words come at me aurally, which is annoyingly sequential compared to reading buckets of text in one eyeful.

So, the bottom line is that the first 10 seconds of your video need to convince me to watch the remainder.

Or I won't.

Is it just me?

What's out there to make video browsing a better, more time-efficient, and more fulfilling experience?