About listeners for different databases in the same ORACLE_HOME

Hello experts, I have a doubt
I have installed 3 different databases in the same server which OS is Suse Enterprise 10. At this moment I have just one listener that registers all the services. The number of connections are big for two of the three databases so I do not know what might be the best practices for this environment. I have some question I would like you suggestion for me:
DB version: 11.1.0.7
Should I have three listener, one for each database?
Is a good practice to have only one listener for multiple instances in the same server?
Are there differents between have only one listener for all the instance and have one listener for instance?
What about the performance?
Than you in advance, I hope you can guide me.

Best practice is not to have multiple databases on one server, depending on resources.
Should I have three listener, one for each database?
No. That is pretty undesirable and requires more administration.
Is a good practice to have only one listener for multiple instances in the same server?
Yes. Remember the listener is only a broker and there are no permanent connections between client, listener and database.
Are there differents between have only one listener for all the instance and have one listener for instance?
Yes. The latter is an administration nightmare.
What about the performance?
Who cares? The only factors are
listener.log becomes too big --> set up proper cleanup procedures
The number of semaphores is exceeded (Unix) or no more threads can be created (Microsoft winblows), which will give rise to ora-12500.
Sybrand Bakker
Senior Oracle DBA

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vi check.sh
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EOF
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sqlplus / as sysdba <<EOF
select query comes here;
exit;
EOFchmod 777 check.sh
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