Cluster_database_instances with dbca ?

Hello,
I've managed to install successfully the additional nodes into cluster (see 10gr1 - RHEL 4 - Is it possible to add nodes to a standby RAC before ?
but I have a final question:
The cluster I'm in charge of is configured with cluster_database_instances=8, and it would need to be 12.
I've read somewhere that using dbca would help me having no downtime because it "manages" this parameter during the addition of the db nodes.
That would make me more comfortable because we need to shutdown all "surrounding" (clients) servers, and the db serves millions of users, who would be negatively impacted by a downtime.
Could someone confirm/infirm this ?
Thanks for you help
Best regards
Edit : forgot to mention that I'm talking now about primary database, on the standby one, I updated the parameter :)
Edited by: Io) on 15 déc. 2008 12:38

Hello Io,
Like I said earlier, you need to plan for this downtime. As this is not modifiable parameter you cannot use dbca to modify it dynamically. I suggest you should come up with a plan in rollout fashion to minimize downtime.
Check this link
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams024.htm
http://www.orafaq.com/parms/parm192.htm
Hope this helps
Regards
OrionNet

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=====================================================
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=======================
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====================================
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Hello,
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You remember that I had problems with the control files and these looked very strange:
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Regards
FireFighter

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Hi Murali,
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My details
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Oracle:10.2.0.1.
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regards
Poorna
Edited by: 873393 on Aug 21, 2011 2:29 PM
Edited by: 873393 on Aug 22, 2011 9:21 AM

pls findand i've given Full controle permissions to the folder.
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Volume in drive E has no label.
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Directory of E:\oracle\product\10.2.0\db_1\assistants\dbca\logs
08/21/2011 11:40 AM <DIR> .
08/21/2011 11:40 AM <DIR> ..
0 File(s) 0 bytes
2 Dir(s) 58,135,355,392 bytes free
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Volume in drive E has no label.
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08/21/2011 11:40 AM <DIR> .
08/21/2011 11:40 AM <DIR> ..
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2 Dir(s) 58,135,355,392 bytes free
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I opened a Service Request. Here is the official answer from Oracle support.
QUESTION
=========
After applying the latest CPU(JAN2008CPU) I have created a new database using DBCA's seed template (General). Do I need to run the catcpu
.sql on the newly created database? Are the seed templates already updated with
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ANSWER
=======
No, as these templates are not containing the Oracle binaries that is updated by the CPU.
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Thanks!
Greetings from Oracle,
Oracle Support Services

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http://download-uk.oracle.com/docs/html/B14203_05/intro.htm#sthref44
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user5846399 wrote:
dbca -silent -createDatabase -templateName General_Purpose.dbc \
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-storageType ASM -diskGroupName DATA_DM01 \
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