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тАО04-14-2004 04:36 AM
тАО04-14-2004 04:36 AM
Solved! Go to Solution.
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тАО04-14-2004 06:03 AM
тАО04-14-2004 06:03 AM
SolutionThey are right. You can not run the same instance on multiple nodes without RAC (or OPS in 8i).
There has to be synchronization between the access which RAC will manage with its lock manager.
Beside synchronization RAC will also offer 'cache fusion', moving blocks from cache to cache directly without needed to bounce of the disk (as they did in OPS)
You can run other instances on other nodes.
So if in your cluster you have node X and Y
and oracle instance DEV, TST and PRD.
You can run
- all on X,
- all on Y,
- DEV on X, TST + PRD on Y
- TST on X, DEV + PRD on Y
- the other 4 combo's
You can NOT run
- PRD on X and Y
- the other 2 double's
hth,
Hein.
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тАО04-14-2004 06:14 AM
тАО04-14-2004 06:14 AM
Re: Oracle 9i on OpenVMS Clusters
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тАО04-14-2004 07:07 AM
тАО04-14-2004 07:07 AM
Re: Oracle 9i on OpenVMS Clusters
well if you do want to take care of performance features like Row cache the situation is not that much different even on Oracle Rdb (as opposed to Oracle 8/9/10), although with JCCs LogMiner Loader (www.jcc.com) one can try to work around this a bit.
Greetings, Martin
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тАО04-14-2004 07:17 AM
тАО04-14-2004 07:17 AM
Re: Oracle 9i on OpenVMS Clusters
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тАО04-14-2004 08:23 AM
тАО04-14-2004 08:23 AM
Re: Oracle 9i on OpenVMS Clusters
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тАО04-14-2004 08:31 AM
тАО04-14-2004 08:31 AM
Re: Oracle 9i on OpenVMS Clusters
to prevent oracle from saying you can't start it up?
ORA_DB_LOGICALS.COM - ERROR:
Attempting to setup environment for instance DEVDB on the wrong node.
You are on node "GRAKLE", but the ora_root:[dbs]sid_DEVDB.properties
file indicates this instance is associated with node "OSPREY"."
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тАО04-14-2004 08:57 AM
тАО04-14-2004 08:57 AM
Re: Oracle 9i on OpenVMS Clusters
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тАО04-14-2004 10:31 AM
тАО04-14-2004 10:31 AM
Re: Oracle 9i on OpenVMS Clusters
Yes well, I am fortunate(?) to be able to be able to ignore licensing costs in my day-to-day work. I put a questionmark there because it detaches me from 'the real worlds' where obviously everthing counts towards an ultimate 'TCO'.
I don't suppose the the license cost is negotiable as a combination of CPU's and RAC such that 2 nodes with 2 cpus would price more similar to 1 node with 4 (assuming you can restrict oracle to 2 out of 4 cpus in a box).
Anyway... a VMS cluster remains (IMHO) very valuable. For starters there is ofcourse the near-transparant failover for the instances.
- the ability to pick and choose node where to run an application (oracle instance)
- the ability to do generic maintenance (backups) from any node
- the 'one system image' managemetn
- on and on...
Thanks for your real life feedback!
Hein.
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тАО04-14-2004 02:44 PM
тАО04-14-2004 02:44 PM
Re: Oracle 9i on OpenVMS Clusters
if you are able to make a tradeoff between performance and cost, Oracle Rdb actually might be an alternative. As far as I know the costs for the database server are the same as for Oracle Classic and support for VMS clusters is build-in (as long as you do not use row caches).
Greetings, Martin