'Linked Servers' section of the Object Explorer cannot see objects. It is empty or there is none displayed.
Right-click a Linked Server | View Details | click the 'Objects' tab on the right | it will get the error below:
The OLE DB provider "OraOLEDB.Oracle" for linked server "AAA_ORACLE_BBB" reported an error. One or more arguments were reported invalid by the provider.
OLE DB provider "OraOLEDB.Oracle" for linked server "AAA_ORACLE_BBB" returned message "The parameter is incorrect.".
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