RE: RAC behavior - with Oracle JDBC Thin Driver - is this expected behavior?

From: Pradeep Chetal <Pradeep.Chetal_at_mformation.com>
Date: Wed, 11 Feb 2009 16:31:33 -0500
Message-ID: <B1C751058F4E7C41BD50130B0750DD93FAF110_at_mfusemail01.mformation.com>


 

Thanks  


From: Bradd Piontek [mailto:piontekdd_at_gmail.com] Sent: Tuesday, February 10, 2009 10:54 PM To: Pradeep Chetal
Cc: Oracle L
Subject: Re: RAC behavior - with Oracle JDBC Thin Driver - is this expected behavior?  

I believe the connect string is only one part of the equation. The 10gR2 JDBC thin driver should be able to subscribe to ONS events, but I believe you have to enable it in the connection pool. check out
http://www.oracle.com/technology/sample_code/products/rac/index.html for some examples.

Bradd Piontek
  "Next to doing a good job yourself,

        the greatest joy is in having someone 
        else do a first-class job under your  
        direction."
  • William Feather

On Tue, Feb 10, 2009 at 6:42 PM, Pradeep Chetal <Pradeep.Chetal_at_mformation.com> wrote:  

Hi,  

We have a Java based app that runs with Weblogic and oracle 10gr2 as the DB.  

We use the following for the RAC string for JDBC connection  

RAC_STRING =       jdbc:oracle:thin:_at_(DESCRIPTION=

            (FAILOVER=ON)
(LOAD_BALANCE=ON)

(ADDRESS=(PROTOCOL=TCP)(HOST=dingo)(PORT=1521))

(ADDRESS=(PROTOCOL=TCP)(HOST=wolf)(PORT=1521))

(CONNECT_DATA=(SERVICE_NAME=msmdb)))
   

We use this with a 2-node RAC and all the API calls to our application are sort of evenly distributed between the 2 nodes.  

Now if for some reason, node 1goes down, we see that NOT all the new API calls go to node-2 RAC. Some of them are lost until we re-start the application.  

I thought the RAC_STRING will be dynamic and will NOT send calls to node 1 if it is down.  

Are we missing any configuration parameters here?  

Thanks,  

  • Pradeep

Pradeep Chetal
Sr. Director - Infrastructure Architecture


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Received on Wed Feb 11 2009 - 15:31:33 CST

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