Oracle : Ошибка ORA-28557

"unknown %s for database link to non-Oracle system"
*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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