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Service Information Registration (283)

原创 网络安全 作者:tsinglee 时间:2007-11-29 15:23:36 0 删除 编辑

Dynamic service registration reduces the administrative overhead for multiple
databases or instances. Information about the services to which the listener forwards
client requests is registered with the listener. Service information can be dynamically
registered with the listener through a feature called service registration or statically
configured in the listener.ora file.

Service registration relies on the PMON process—an instance background process—to
register instance information with a listener, as well as the current state and load of
the instance and shared server dispatchers. The registered information enables the
listener to forward client connection requests to the appropriate service handler. Service
registration does not require configuration in the listener.ora file.

The initialization parameter SERVICE_NAMES identifies which database services an
instance belongs to. On startup, each instance registers with the listeners of other
instances belonging to the same services. During database operations, the instances of
each service pass information about CPU use and current connection counts to all of
the listeners in the same services. This enables dynamic load balancing and connection
failover.

服务信息注册
1. 服务信息既可以通过服务注册功能动态地注册到监听器,也可以静态地在listener.ora 文件中
进行注册。
2. 服务注册功能依赖 PMON 进程 : 将实例信息注册到监听器,同时被注册的还有实例及共享服务
调度器的当前状态及工作负载
3. SERVICE_NAMES 表明了实例属于哪个服务 . 实例启动时, 属于同一服务的实例都要注册到为
此服务进行监听的监听器中 .
4. 在数据库运行期间,属于同一服务的所有实例要将其 CPU 使用信息及当前用户连接数传递给此
服务的监听器。这些信息被用于实现动态负载平衡及恢复失败连接

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