How to debug a gateway problem.
Example:
HS_FDS_TRACE_FILE_NAME=dblink_trace.txt
HS_FDS_TRACE_LEVEL=ON
Specifies whether error tracing is turned on or off for gateway connectivity.
The following values are valid:
Specifies the name of the table created in the non-Oracle system for logging transactions. For more information about the transaction model, see the HS_TRANSACTION_MODEL parameter.