Oracle : Ошибка 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.


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