ORA-28509: unable to establish a connection to non-Oracle system
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Answer / guest
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=<name> 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.
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