RE: RAC Failover testing

From: Rich Amick <rAmick_at_dotster.com>
Date: Fri, 25 Aug 2006 13:20:17 -0700
Message-ID: <19775.52781156537221.scalix0.corp.dotster.net@MHS>

Even with TAF, the code is responsible for replaying any uncompleted transactions.

Please see:

http://download-west.oracle.com/docs/cd/B10501_01/rac.920/a96597/pshavdtl.ht m#7001

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Anurag Verma
Sent: Friday, August 25, 2006 10:17 AM
To: oracle-l_at_freelists.org
Subject: RAC Failover testing

Hi,

I am doing Testing on Oracle 9i RAC databases now. Ours is a 2-node RAC on IBM HACMP with GPFS.

The TNS entry on the client side, I use is given below:

MYDB =
(DESCRIPTION =
(ENABLE=BROKEN)
(FAILOVER=ON)
(LOAD_BALANCE=ON)
(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST=RAC1.NODE1.com)(PORT=1521)) (ADDRESS = (PROTOCOL = TCP)(HOST=RAC2.NODE2.com)(PORT=1521)))

     (CONNECT_DATA =
      (SERVICE_NAME=FNWFI1)
      (FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)(RETRIES=250)(DELAY=5))

)
)

For Failover testing, I connected to the first node, and ran a long SELECT query.
When the SELECT runs, I shut down the instance in the first node, with "shutdown immediate" command.

I get the following message.

ERROR:
ORA-01089: immediate shutdown in progress - no operations are permitted

960 rows selected.

SQL>
SQL> ex
ERROR:
ORA-25408: can not safely replay call

Here above, if I do not exit and check the V$instance, it shows the session got switched over
to the surviving instance, even though the SELECT got stopped.

Why this is happening, as I am using (ENABLE=BROKEN) and (TYPE=SELECT) options???

Surprisingly, the test succeeds on some other servers with the same DB Physical structure
and memory parameters, by automatically failing over the SELECT query to the surviving node, and without the
query being halted.

Is there any Operating System setting we need to set for successful failover?

Thanks in advance,

Best Regards,
Anurag

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Received on Fri Aug 25 2006 - 15:20:17 CDT