By RickRamsey-Oracle on Sep 15, 2014
The service department of a local Harley Davidson dealer has a display that compares a chain driven cam to a gear driven cam. Each type of cam drive is attached to a cam support plate, and the service writer walks you up to the display and invites you to turn each of them. The chain drive is hard to turn, but the gear drive turns easily.
The message is clear: replace the chain-driven cam in your Harley with a gear-driven cam, and you'll have more power. The display gets the message across brilliantly. Except that it's bogus.
I've spun the chain drive taken out of a Harley Davidson, and it turns just as easily as the gear drive. Heck, why wouldn't it? In their zeal to convince us of the benefits of gear-driven cams, the boys at the dealership tightened down the chain drive in their display perhaps a bit too enthusiastically.
Oracle makes some pretty big claims about its engineered systems, too. For instance, you've probably heard something along these lines for the Oracle Exadata Database Machine:
"An engineered system with preconfigured, pretuned, and pretested hardware and software components that is designed to be the highest performing and most available platform for running Oracle Database."
How can you know whether these claims are true? Because you have Brian Bream on your side, that's why. Brian is the Chief Technology Officer at Collier IT, and Instructor of the Year for both Oracle University and Sun Microsystems University. He knows his stuff. And he just wrote an article that will interest anyone who manages an Exadata Database Machine.
by Brian Bream
The Oracle Exadata Database Machine gives sysadmins three monitoring technologies and two monitoring tools for its storage servers. Brian explains how they work, and how you can use them to monitor metrics, thresholds, and alerts (incidents), how to check the availability of your storage servers, and how to compare metrics for multiple storage servers.
More From Brian Bream
- Video Interview: Elasticity - The Biggest Challenge Facing Data Centers Today
- Blog: The Old School Sysadmin - A Dying Breed?
- Blog: About Oracle Solaris Process Scheduling Classes
About the Photograph
Photo of the cam chain tensioner on a 2005 Harley Davidson Road King taken by my good buddy Madera Doug.
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