Multiple instances operated on a single database on a single machine

Hi friends,
Can anybody tell that "Is it possible to operate multiple instances on a single database on a single machine"!?.
If so.., where this case is useful.
Please help on this doubt.
Thanks in advance.
Thanks
Srinivasa Rao

Hi,
I just asked whether it is possible or not. It is not much important. As you said, OPS will perform well if instances are on different machines. I agree on this. But I think we need to replicate the database on other machine also to run fast.Am I right?..If not, please correct me...
Thanks for valuable information.
I just re-read your post. When you say multiple instances on a single database, it sounds to me like you are asking about Oracle Parallel Server in 8i. I don't know why you would (or even if you could) have multiple instances on the same box. I don't think that would make sense since on of the benefits of OPS is to have more processing power by using multiple machines.

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Ah, youre actually asking different things.
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I am using JDeveloper and SOA Suite 11.1.1.6. I need to read from multiple JMS Topics and transform and enhance the messages through the Mediator and then persist into Database.
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Hi thanks for the reply.
Yes I did restart the listener using an /etc/init.d/oracle_dg4msql script I created when I established the original instance. Interestingly, the output mentions only the one dg4msql instance with one service. It's like my listener.ora isn't even being used or the oracle_home isn't set correctly... D'oh!! Thanks for making me take a closer look. The correct listener.ora is not +/export/app/oracle-ee/product/dg4msql/dg4msql/admin/listener.ora+, it's +/export/app/oracle-ee/product/dg4msql/network/admin/listener.ora+. Yet another headache averted. Talk about annoyance! I'll put a big fat README reminder in that faux config folder. Thank you again.
Starting /export/app/oracle-ee/product/dg4msql/bin/tnslsnr: please wait...
TNSLSNR for Linux: Version 11.1.0.6.0 - Production
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Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
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SNMP                      OFF
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Listener Log File         /export/app/oracle-ee/diag/tnslsnr/vhamiwsqlan/dg4msql/alert/log.xml
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+(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=server.domain.etc.etc)(PORT=1522)))+
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Hi Gurus,
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if i want to install 2 sap instances in a single machine in windows how to proceed?
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Multiple instances operated on a single database on a single machine

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