问题: SQL> connect sys/password @RAOASYS as sysdba ERROR: ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务   Solution: 1.打开/network/admin/listener.ora文件,找到: SID_LIST_LISTENER =   (SID_LIST =     (SID_DESC =       (SID_NAME = PLSExtProc)       (ORACLE_HOME = d:\oracle\product\10.2.0\db_1)       (PROGRAM = extproc)     ) )   2. 添加:            (SID_DESC =        (GLOBAL_DBNAME = RAOASYS)        (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)         (S

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