1、配置服务器端参数
1.1、必填
dispatchers='(protocol=tcp)(dispatchers=2)’
shared_servers=2
1.2、可选项（均为9i中的默认值）
max_dispatchers=5
max_shared_servers=20
circuits=170
shared_server_sessions=165

2、配置客户端参数
XIFENFEI =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER =SHARED)
(SERVICE_NAME = xifenfei)
)
)
note：
1）DEDICATED为非共享模式，若无指定，默认先用shared
2）shared不能startup、shutdown、backup数据库等操作

3、查看当前会话的服务器模式
select sid,server from v$session where sid in (select sid from v$mystat);
select circuit,dispatcher,status from v$circuit;–只有shared连接记录保存在这个视图中