ORA-25431：Connection with protocol string is disallowed by the outbound_dblink_protocols parameter.
错误码
错误描述：Connection with protocol string is disallowed by the outbound_dblink_protocols parameter.
错误原因：An attempt to connect using the database link failed because the network protocol used for the database link is disallowed.
解决方法：Either set the value of the outbound_dblink_protocols initialization parameter appropriately to include the required protocol or change the protocol used by the database link to conform to the protocols allowed by the outbound_dblink_protocols parameter.
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