文档解释
ORA-28509: unable to establish a connection to non-Oracle system
Cause: Initialization of a database link to a non-Oracle system failed to connect to the Heterogeneous Services agent process for this non-Oracle system.
Action: Check the Net8 service name definition in the following places: — the USING clause of the CREATE DATABASE LINK statement — the TNSNAMES.ORA file — the Oracle Names Server The following are possible reasons for name mismatches: — The USING clause in the CREATE DATABASE LINK statement has to match the service name defined in the TNSNAMES.ORA file or in the Oracle Names Server. — The protocol-specific information in the service name definition must match the protocol-specific definition of the responding listener. — The SID= in the service name definition (in the TNSNAMES.ORA file or in Oracle Names Server) must match the value in the LISTENER.ORA file for the responding listener.
官方解释
常见案例
一般处理方法及步骤
1.首先，检查网络连接是否正常并仔细检查服务名称，确保它是正确的，以便Oracle可以访问外部系统。
2.然后，检查外部系统中设置的网络权限和保护，如果有问题，可能需要更改来允许来自Oracle的连接。
3.最后，要检查目的地的系统，试图确定是否是DRDA和DRCP问题。
