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This is the preferred method by which an instance will register with a listener The initialization parameter local_listener tells the instance the network address that it should contact to find a listener with which to register At instance startup time, the PMON process will use this parameter to locate a listener, and inform it of the instance s name and the names of the service(s) that the instance is offering The instance name is defined by the instance_name parameter, and the service_names parameter will have defaulted to this suffixed by the db_domain parameter, which will default to null It is possible to create and start additional services at any time, either by changing the value of the service_names parameter (which can be a comma-delimited list, if the instance is to offer several services) or programmatically using the DBMS_SERVICE package Any change to the services must be registered with the local listener If this is not done, the listener won t know what services are being offered, and will therefore not
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be able to set up sessions to them The PMON process will register automatically once a minute, but at any time subsequent to instance startup you can force a re-registration by executing the command
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SQL> alter system register;
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TIP You will need to register your instance with the listener with alter system register if you have restarted the listener, or if you started the database instance before starting the listener or you can wait a minute for PMON to register Dynamic registration is a better option than static registration because it ensures that only running instances and available services are registered with the listener, and also that there are no errors in the instance and service names It is all too easy to make mistakes here, particularly if you are editing the listenerora file by hand Also, when the instance shuts down, it will deregister from the listener automatically From release 9i onward, dynamic registration requires no configuration at all if your listener is running on the default port, 1521 All instances will automatically look for a listener on the local host on that port, and register themselves if they find one However, if your listener is not running on the default port on the address identified by the hostname, you must specify where the listener is by setting the parameter local_listener and re-registering, for example,
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SQL> alter system set local_listener=list2; SQL> alter system register;
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In this example, the local_listener has been specified by name This name needs to be resolved into an address in order for the instance to find the listener and register itself, as described in the following section An alternative technique is to hard-code the listener s address in the parameter:
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SQL> alter system set local_listener='(address=(protocol=tcp)(host=127001)(port=1522))';
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This syntax is perfectly acceptable, but the use of a name that can be resolved is better practice, as it places a layer of abstraction between the logical name and the physical address The abstraction means that if the listening address ever has to be changed, one need only change it in the name resolution service, rather than having to change it in every instance that uses it
Techniques for Name Resolution
At the beginning of this chapter you saw that to establish a session against an instance, your user process must issue a connect string That string resolves to the address of a listener and the name of an instance or service In the discussion of dynamic instance registration, you saw again the use of a logical name for a listener, which needs to be resolved into a network address in order for an instance to find a listener with which to register Oracle provides four methods of name resolution: easy connect, local
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