Comments on: TNS Listener Configuration for Oracle RAC

By: Roberto Pinel

Roberto Pinel — Thu, 23 Apr 2009 17:11:11 +0000

Hi, Good article, I have Oracle 11.1.0.7 with Rhel 5, 3 nodes, but I have a problem, I got the tns-12520 3 times a day, no one cant connect and I have to restar the database, The parameter process is 800 and I have the local_listener with the same address from tnsnames.ora in each server, the workaround that I use was to change the local_listener valur for the remote_listener value, and work fine, no more connection problems, but I know that is not correct, have you seen this problem before.

Thanks

By: Dan Norris

Dan Norris — Sat, 11 Apr 2009 08:53:13 +0000

A few ideas come to mind. To answer your question, you could use a tns
entry that references all instances/servers to check overall
availability and also separately check each individual instance to
determine availability.

You might also consider using clusterware callouts to alert you.
Scripts placed in ora_crs_home/racg/usrco will be run whenever
clusterware detects a resource offline. That may be easier than
writing your own custom polling method.

Please excuse my typos, I sent this from my iPhone.

By: vnkt

vnkt — Sat, 11 Apr 2009 00:59:17 +0000

Hi I have a situation where i need to develop a monitoring solution for checking the availability of oracle database instances on a rac system.
I need to alert not only when the overall rac system is unavailable but also when one of the instances on a node is not available while overall the rac system is available(thro other isntances).
I already have developed a monitoring solution for single instance oracle database where the script connects to an oracle instance and if unable to then raises alert. Can i have a similar approach for rac — where in i can specify the overall sid of the rac to check the overall avaialability and individual sid of each instance to check the individual availability ?

By: Dan Norris

Dan Norris — Tue, 24 Feb 2009 11:43:19 +0000

You need to include the listener name. So, it should be “status
LISTENER_NODENAME” if you follow the standard conventions used by NetCA
during a typical install.

Dan

By: rvk

rvk — Tue, 24 Feb 2009 07:58:50 +0000

On production env we are running our 10.1.5 on linux 64bit.with 5 node RAC.

When i check out with lsnrctl> status ----- no listner message i got.

but we are able to connect to db remotely

thanks

By: Log Buffer #107: A Carnival of the Vanities for DBAs

Log Buffer #107: A Carnival of the Vanities for DBAs — Fri, 20 Feb 2009 21:15:56 +0000

[...] over the years. For some good information on configuring the TNS listner for Oracle RAC take a look here for some help from Dan Norris. Freek D’Hooge wrote a program to gather and mangage the cbo [...]

By: Dan Norris

Dan Norris — Wed, 07 Jan 2009 19:04:02 +0000

I don't understand what you're asking. Clients initiate connections to remote servers, not listeners. Listeners may redirect a client to another listener on a remote server, but listener on server1 will never actually connect to an instance on server2. In a cluster, if I make a connection request to the listener on server1 and the listeners have metrics indicating that I should connect to instance2 on server2, then instance1 will direct me to the listener on server2 where my client will request the same service and be granted connection.

Hope that helps.

By: Anupam Khaund

Anupam Khaund — Mon, 05 Jan 2009 11:57:01 +0000

How to Configure a Listener in a local database that connects to a Remote RAC Database

By: Dan Norris

Dan Norris — Wed, 03 Dec 2008 11:25:54 +0000

By default, the local_listener parameter will be set to the local host's primary IP address (the one that corresponds to the hostname in the hosts file). That's not desirable because if users are directed to that IP address, they won't be able to connect to the database because the listener *only* listens on the VIP, not on the default IP of the host. Any connections to IP addresses that are NOT the VIP address will result in a failure to connect. So, yes, the local_listener *must* be set if you follow my configuration guidelines above.

By: Bashir Ahmad

Bashir Ahmad — Tue, 02 Dec 2008 22:26:17 +0000

Do we must need to configure local_listner parameter, I know if listner is default, instance can register itself with listner without local_listner parameter, Does it work differently in RAC? or we can't use default listner in RAC. Please help me in this regard.
Thanks