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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Multiple Listeners
-----Original Message-----
Sent: Wednesday, October 16, 2002 4:20 PM
A single listener and a single Intelligent Agent should be all that is needed. It may be clever to see if multiple listeners can run, but even Oracle will tell you that running multiple listeners is worse than foolish.:) In addition to changing the Oracle Home, the LD_LIBRARY_PATH or LIBPATH would have to be changed as well to match the libraries to the correct version of the listener.
-----New Stuff----
Yes, I cut a lot. :) I will agree that having 1 listener per box is all you _should_ need. However, due to experience with past bugs (and who knows
when similar problems may appear in the future) and as you concede, running
high availability fail over services, I would disagree with the assertion
that
multiple listeners are "worse than foolish". A single listener is a single
point of failure across multiple instances, eliminating that is not foolish,
and there are other reasons one might want to run multiple listeners. What
about extproc (if you need it for some reason). Oracle itself _requires_ 3
listeners for the apps the last time I checked (1 for the db, 2 for external
program calls). To analyze network traffic, it is sometimes useful to be
able
to isolate particular port traffic. Multiple listeners allow for this kind
of work too.
So, while only 1 may be all that is necessary, there is no real reason,
IMHO,
that multiple listeners are inherently a bad practice.
John P Weatherman
Database Administrator
Replacements Ltd.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: John Weatherman
INET: john.weatherman_at_replacements.com
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