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SQL>conn sys/test@test as sys dba
ERROR:
ORA-12545: 因目标主机或对象不存在, 连接失败
 
警告: 您不再连接到 ORACLE。

修改local_listener参数，指定为tnsnames.ora配置的LISTENERS_DB：

SQL> show parameter local_listener
 
NAME                                 TYPE                   VALUE
------------------------------------ ---------------------- ------------------------------
local_listener                       string
SQL> alter system set local_listener='LISTENERS_DB' scope=both sid='*';
 
System altered.

tnsnames.ora中配置：

LISTENERS_DB =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip)(PORT = 1521))
  )