orcl_ha=
    (description=
       (address = (host = dbprod)(protocol = tcp)(port = 1521))
       (address = (host = dbstandby)(protocol = tcp)(port = 1521))
     (failover = yes)
     (connect_data =  
       (service_name = orcl_taf)
       (failover_mode = 
         (type = select)
          (method = basic)
       )
  )
)

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Linux,oracle