Modifying Configuration for Transport Failover

This task modifies the Oracle network configuration files that are used for transparent failover to the downstream Recovery Appliance.

If you have a RAC database, this should be performed on each host where the protected database runs.

Verify that there are no ${ORACLE_HOME}/dbs/ra${ORACLE_SID}.ora files on any of the hosts.
This file has the effect of overriding all the configuration parameters defined in this step and should be removed if present.
Configure a TNS alias in the tnsnames.ora file that will be used by RMAN to connect to the correct Recovery Appliance.
```
$ cd ${ORACLE_HOME}/network/admin
```

Edit tnsnames.ora and add the following entry:

DR_RAHADR =
(DESCRIPTION_LIST =
  (LOAD_BALANCE = off)
  (FAILOVER = on)
  (DESCRIPTION =
    (CONNECT_TIMEOUT = 5)
    (TRANSPORT_CONNECT_TIMEOUT = 3)
    (RETRY_COUNT = 3)
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ra1ingest-scan)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = rahadr1)
    )
  )
  (DESCRIPTION =
    (CONNECT_TIMEOUT = 5)
    (TRANSPORT_CONNECT_TIMEOUT = 3)
    (RETRY_COUNT = 3)
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ra2ingest-scan)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = rahadr2)
    )
  )
)
DR_RAHADR1 =
(DESCRIPTION_LIST =
  (DESCRIPTION =
    (CONNECT_TIMEOUT = 5)
    (TRANSPORT_CONNECT_TIMEOUT = 3)
    (RETRY_COUNT = 3)
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ra1ingest-scan)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = rahadr1)
    )
  )
)
DR_RAHADR2 =
(DESCRIPTION_LIST =
  (DESCRIPTION =
    (CONNECT_TIMEOUT = 5)
    (TRANSPORT_CONNECT_TIMEOUT = 3)
    (RETRY_COUNT = 3)
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ra2ingest-scan)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = rahadr2)
    )
  )
)