1.运行db的sqlplus：sqlplus sys/sys as sysdba （sys/sys为“用户名”/“密码”）
或配置client的监听后运行Client的sqlplus
2. （可省略）查看当前服务名：SQL> show parameter service_name
3. 修改服务名：SQL> alter system set service_names=\'orcl\' scope=both;
4. 修改listener.ora（红色部分）：
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = E:\Oracle10g)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = ORCL)
(ORACLE_HOME = E:\Oracle10g)
(SID_NAME = ORCL)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = onest)(PORT = 1521))
)
)
转自：https://blog.csdn.net/huronzhu/article/details/37047819