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Undocumented but appears to relate to Data Guard Physical Standby DataPump Support
Owned by SYS with EXECUTE granted to EXECUTE_CATALOG_ROLE role
Demo code doesn't fail but neither is there an output
obj_name IN VARCHAR2,
obj_schema IN VARCHAR2,
obj_type IN NUMBER,
tgt_version IN VARCHAR2,
action OUT VARCHAR2,
alt_name OUT VARCHAR2,
where_clause OUT VARCHAR2);