Re: Useful piece of software

From: Mladen Gogala <>
Date: Mon, 30 Apr 2012 20:50:54 +0000 (UTC)
Message-ID: <>

On Mon, 30 Apr 2012 12:33:43 -0700, onedbguru wrote:

> You have that problem only if you don't know DNS/bind :) :)

Which is true: I don't know DNS/bind. That is precisely why I recommend dnsmasq: it's simple, intuitive and does the job.

> Just an FYI, you will have problems is you leave the SCAN-address(es) in
> the /etc/hosts file... you can only have one "name" entry in that file -

The names are not on the nodes, the names are in the name server /etc/hosts file. I don't envision ever referencing them directly.

> if you have more than one, it will always read the first one. Make sure
> that when you nslookup multiple times that the scan-ip changes... Also,
> even in a two-node RAC, it is still recommended to have 3 scan
> addresses.

SCAN is a load balancing mechanism. There is a single name used to reach RAC and the listener will then dispatch the connection to the appropriate service. What would be the purpose of having 3 addresses for 2 nodes? Who has made that recommendation and why? I don't really want to do much with the SCAN listener, but Oracle mandates it, so I had to use shortcuts. I am not going to become a network administrator in order to install RAC.

Received on Mon Apr 30 2012 - 15:50:54 CDT

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