i have sys access data guard standby db, need find primary one. searching in oracle docs couldn't find help.
you can check options checking fal_server parameter, log_archive_dest_n parameters, dataguard broker, recovery catalog, cloud control, etc.. if used, none of them mandatory dataguard configuration.
in fact, standby nodes doesn't need send kind of information primary db @ all. since heartbeat checked primary, best approach query v$session , track down sessions connected the, non-existent, "public" schema.
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