ORA-28557: unknown string for database link to non-Oracle system
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Answer / guest
Cause: When attempting to connect to a non-Oracle system
through a Heterogeneous Services database link, the agent
supporting this non-Oracle system failed to return
FDS_CLASS_NAME and/or FDS_INST_NAME. ORACLE requires these
names to configure the heterogeneous database link.
Action: Contact the DBA to check setup of the connection and
the Heterogeneous Services agent.
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