ORA-12560: TNS: 協議適配器錯誤 常見原因

ORA-12560: TNS: 協議適配器錯誤  常見原因 或者報以下錯誤 （ Listener refused the connection with the following error:ORA-12514, TNS:listener does not currently know of service requested in connect descriptor   The Connec

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