Best practice for listeners for multiple oracle homes - 1 listener?

I have a machine with 9i and 10g on it, and I have set up a 10g listener to serve connections to the 9i and 10g databases.
Is this best practice, or is it better to have two listeners - a 9i listener for th 9i databases and a 10g listener for the 10g databases?

HI,
Are they two production databases ? In this case, like Laurent said, perhaps it's better to have one listener per instance, if one shutdown, it doesn't disturbe the other.
Are they different application level (1 for dev, 1 for validation...), here too, perhaps it's better to have one listener per instance, if one shutdown, it doesn't disturbe the other.
Are they two development databases ? In this case, you can to have one listener for all databases
I don't think that there is only one way, but there is too many configuration which make one solution is better that other.
Nicolas.

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Best practice for listeners for multiple oracle homes - 1 listener?

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