RAC TNS Entry for FAILOVER

Hi DBAs,
We have a 4 node RAC Database (10.2.0.4) on Solaris 5.10. Sometime for maintenance we brought 2 nodes down. And using a service (which include all the VIPs for all oracle instances) If I try to connect to the database, I get error TNS Service not available and after 3-4 tries it automatically connect.
I have not specified the FAILOVER parameter in the TNSNAMES.ORA. Assuming the default value is FAILOVER=ON.
Please suggest do I need to explicitly define the value for FAILOVER, if so what would be the appropriate value - FAILOVER=ON or FAILOVER=YES. Also what is the difference between FAILOVER=ON & FAILOVER=YES .
Thanks
-Samar-

Hi Samar,
Put the vip addresses on your tnsnames.ora as the sample bellow.
ORCL =
(DESCRIPTION =
(LOAD_BALANCE = ON)
(FAILOVER = ON)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = host1-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = host2-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = host3-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = host4-vip)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.com)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 10)
(DELAY = 1)
This video from Pythian by Alex Gorbachev will help you to clarify about vip addresses use http://www.pythian.com/news/2624/pythian-video-oracle-rac-why-vips
Regards,
Rodrigo Mufalani
http://mufalani.blogspot.com

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SQL*Plus: Release 11.2.0.3.0 Production on Fri Apr 20 17:11:19 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
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C:\oracle>sqlplus qa1@NLS
SQL*Plus: Release 11.1.0.6.0 - Production on Tue Apr 24 10:12:31 2012
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Enter password:
Connected to:.............................................................................
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SQL*Plus: Release 11.1.0.6.0 - Production on Tue Apr 24 10:14:30 2012
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Enter password:
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SCAN listener LISTENER_SCAN2 is running on node orarac2
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Cardinality: 1
Disconnect: false
Service role: PRIMARY
Management policy: AUTOMATIC
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AQ HA notifications: false
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Failover method: NONE
TAF failover retries: 0
TAF failover delay: 0
Connection Load Balancing Goal: LONG
Runtime Load Balancing Goal: NONE
TAF policy specification: NONE
Edition:
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refer:-
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http://www.oracle-base.com/articles/11g/duplicate-database-using-rman-11gr2.php
http://aprakash.wordpress.com/2011/01/24/duplicate-database-using-from-active-database-clause-11gr2/
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ype - which is ideal settings for TNS entries is that type Session or Select . In sessions new session is automatically created in failover. Am not getting that type select where it says 'users with open cursors continue fetching on them after failure'?I am not sure about the "ideal" but the meaning of Select would be that using the same session state, RAC would be able to run your query , from the another node , from the same point where the session got disconnected on the first node. In other words, if on node 1 , your query fetched 50 rows from an output of 100 rows in total and session got disconnected at 51st row, after the failover, the query would continue from the 51st row only from node 2.
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Here is some excerpts:
==============
oracle@x523:/oracle/app/oracle/product/10.2.0/db_3/network/admin> sqlplus sys/here2go@TRCN523 as sysdba
SQL*Plus: Release 10.2.0.4.0 - Production on Thu Aug 9 03:17:59 2012
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
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=======================
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==============
TRCN =
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(FAILOVER = ON)
(LOAD_BALANCE = ON)
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# (SERVICE_NAME = TRCN.coat.com)
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(ADDRESS = (PROTOCOL = TCP)(HOST = x523.coat.com)(PORT = 63092))
(CONNECT_DATA =
(SERVER = DEDICATED)
# (SERVICE_NAME = TRCN.coat.com)
(SERVICE_NAME = TRCN523)
(INSTANCE_NAME = TRCN523)
NET_TRCN_X523 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = x523.coat.com)(PORT = 63092))
============
Listener:
=====
SID_LIST_NET_TRCN_X523 =
(SID_LIST =
(SID_DESC =
(ORACLE_HOME = /oracle/app/oracle/product/10.2.0/db_3)
(SERVICE_NAME = TRCN.coat.com)
(SID_NAME = TRCN523)
(SID_DESC =
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(ORACLE_HOME = /oracle/app/oracle/product/10.2.0/db_3)
(PROGRAM = extproc)
==========================================
oracle@x523:/oracle/app/oracle/product/10.2.0/db_3/network/admin> tnsping TRCN523
TNS Ping Utility for Linux: Version 10.2.0.4.0 - Production on 09-AUG-2012 03:21:09
Copyright (c) 1997, 2007, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = x523.coat.com)(PORT = 63092)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = TRCN523) (INSTANCE_NAME = TRCN523)))
OK (0 msec)

Handle:      784786
Status Level:      Newbie
Registered:      Jul 27, 2010
Total Posts:      211
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