[系统运维]Enabling Advanced Features of Oracle Net Services

Supported by Oracle Net for connection to Oracle Database instances

1. Source Routing enables the use of Connection Manager (CMAN) which enables network traffic to be routed through a firewall.

2. Load Balancing can balance the number of connections to dispatchers when using a Shared Server configuration.

3. Connect Time Failover requires the connect string to have two or more listener addresses configured.

连接时故障转移或客户端负载平衡

不能使用连接时故障转移或客户端负载平衡设置源路由。源路由按顺序连接到列表中的每个地址，而连接时故障转移和客户端负载平衡则从列表中选择一个地址。连接负载平衡特性通过平衡多个分派器之间的活动连接数来提高连接性能。在 OracleReal Application Clusters(Oracle RAC)环境中，连接池负载平衡还可以平衡多个实例之间的活动连接数。

Understand how to configure the advanced features of Oracle Net Services, including advanced connect data parameters, load balancing, failover, and connections to non-database services.

客户端负载平衡

连接时故障转移

Dispatchers in a Shared server configuration

1. writing inbound request to the common request queue from all shared server connections.
2. receiving inbound requests from processes using shared server connections.
3. sending shared server session responses back to requesters on the appropriate connection.