Question

JDBC connection string on Linux to Oracle RAC 10g

Asked by: simst6

hello,
I'm using the following jdbc connection string on my application to connect to an Oracle 10g RAC
My problem is that when performing a failover on the RAC my application stops working and can't see the second node that is up.  The application works fine using the connection string but errors out when a failover happens. I've tried switching the position of the nodes on the connection string and it successfully connects to either node1 or node2, so I know there is no problem connecting to either node. Just when one node is down it won't see the other node.

jdbc:oracle:thin:@(DESCRIPTION=(load_balance=on)(FAILOVER=on)
(ADDRESS_LIST=(
ADDRESS=(PROTOCOL=TCP)(HOST=rac1vip)(PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=rac2vip)(PORT=1521)))
(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=PRODDB)))

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Asked On
2009-08-19 at 14:48:48ID24666527
Topic

Oracle Database

Participating Experts
2
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Comments
3

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Answers

 

by: markgeerPosted on 2009-08-20 at 05:46:29ID: 25141738

In our RAC system, we have "YES" instead of "on" for two of those parameters, so where you have:
(load_balance=on)(FAILOVER=on)
we have:
(load_balance=YES)(FAILOVER=YES)

I'm not sure if "YES" and "on" are both supported there, or not.

 

by: rolutolaPosted on 2009-08-21 at 04:19:51ID: 25150621

I think you're trying yo implement TAF. What you've done is sufficient for initial connection but would not help you for changing over mid-session.

You need to create a service which would be same for all your RAC instances.

You then need to run DBMS_SERVICE_ADD_SERVICE package as follows:

Note: service_alias value of NETWORK_NAME parameter must be defined  in tnsnames.ora on all participating instances.



EXEC DBMS_SERVICE_ADD_SERVICE (
SERVICE_NAME => '<service_name>',
NETWORK_NAME => '<service alias>',
FAILOVER_METHOD => 'BASIC',
FAILOVER_TYPE => 'SELECT',
FAILOVER_RETRIES => 180,
FAILOVER_DELAY => 1);

                                              
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by: simst6Posted on 2009-08-26 at 16:02:38ID: 25193167

thanks for the comments!  I found out this is what worked to get it to failover properly.
jdbc:oracle:thin:@(DESCRIPTION=(load_balance=on)(FAILOVER=on)(ADDRESS_LIST=(
ADDRESS=(PROTOCOL=TCP)(HOST=rac1vip)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=rac2vip)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=PRODDB)))

And also following what this metalink article says to do:
metalink article 213412.1

20120131-EE-VQP-002

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