||Oracle Tips by Burleson
10g Grid Computing
Real Application Cluster Architecture
The listener.ora file contains the information
needed by the SQL*Net listener file to identify the instances for
which connection requests are being serviced. If no instances are
listed in the listener.ora, the listener process will wait for the
instances to self-register (instances have been capable of
self-registering since Oracle8i). Below is shown a basic
listener.ora file for use with RAC.
If advanced features such as load balancing and
automatic failover are desired, there are optional sections of the
listener.ora file that must be present. For example, to configure
load balancing, the listener.ora file (using an
instance name of "test") would be appropriate. The listener file
must be the same on the servers that are participating in the load
balancing for RAC. The second listener, "listener_test1" allows use
of Oracle Enterprise Manager with the instance.
You should never configure the global_dbname
parameter with Oracle RAC if you wish to use connect time failover
or transparent application failover. Setting this parameter will
disable these capabilities.
For the second server, the second listener would be called
"listener_test2", and all instance specific references would be
changed to "test2", while all server specific references would be
changed to "testlinux2".
If a port other than 1521 is utilized, then the
local_listener parameter in that instances local init.ora file must
be set to the same port value. For example, if we used port 1525
instead of 1521, all references to port 1521 in the listener.ora
would be changed to 1525, and the following entry would
have to be added to the local init.ora:
The above text is
an excerpt from:
Oracle 10g Grid & Real Application
Computing with RAC
by Mike Ault, Madhu Tumma
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