1. Deploy a hybrid DR topology for an on-premises Oracle Exadata
  2. Configure the Listeners and SQLNet.ora

Configure the Listeners and SQLNet.ora

Configure the listeners on all nodes for the Oracle Database Exadata Cloud Service and the on-premises Oracle Exadata Database Machine.

Add a Static Listener to the Standby Instance

Add a static listener to Grid Home on the Oracle Database Exadata Cloud Service instance.

  1. Create a listener file on Node 1 of the Oracle Database Exadata Cloud Service instance.
    The following is a sample file. Change the GLOBAL_DBNAME and SID_NAME for your environment. 
    [grid@exacs82-vm3sv1 admin]$ cat listener.ora
    LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER))))
# line added by Agent
LISTENER_SCAN3=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN3))
))
# line added by Agent
LISTENER_SCAN2=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2))
))
# line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1))
))
# line added by Agent
ASMNET1LSNR_ASM=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=ASMNET1LSNR_ASM
))))
# line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_ASMNET1LSNR_ASM=ON
# line added by Agent
VALID_NODE_CHECKING_REGISTRATION_ASMNET1LSNR_ASM=SUBNET
# line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON
# line added by Agent
VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN1=OFF
# line added by Agent - 
Disabled by Agent because REMOTE_REGISTRATION_ADDRESS is set
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN2=ON
# line added by Agent
VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN2=OFF
# line added by Agent - 
Disabled by Agent because REMOTE_REGISTRATION_ADDRESS is set
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN3=ON
# line added by Agent
VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN3=OFF
# line added by Agent - 
Disabled by Agent because REMOTE_REGISTRATION_ADDRESS is set
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON
# line added by Agent
VALID_NODE_CHECKING_REGISTRATION_LISTENER=SUBNET
# line added by Agent
SSL_CLIENT_AUTHENTICATION = FALSE
WALLET_LOCATION=(SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = 
/var/opt/oracle/dbaas_acfs/grid/tcps_wallets)))
SID_LIST_LISTENER =
(SID_LIST =
  (SID_DESC =
   (GLOBAL_DBNAME = DB1_phx3g7)
   (ORACLE_HOME = /u02/app/oracle/product/19.0.0.0/dbhome_5)
   (SID_NAME = DB11)
  )
)
  2. Log into the node as the opc user.
    ssh -i cluster.key opc@10.255.195.131
  3. Sudo to grid user.
    sudo su - grid
  4. Update the environment.
    $ . oraenv
ORACLE_SID = [DB11] ? +ASM1
    The output will look similar to the following:
    The Oracle base has been changed from /u02/app/oracle to /u01/app/grid
  5. Confirm that the listener files are in the $ORACLE_HOME/network/admin directory.
    cd $ORACLE_HOME/network/admin
ls -lrt
  6. Reload the listener.
    [grid@exacs82-vm3sv1 admin]$ lsnrctl reload
  7. Check the status of the listener.
    [grid@exacs82-vm3sv1 admin]$ lsnrctl status
    The output will look similar to the following:
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date                18-JAN-2021 03:42:09
Uptime                    10 days 8 hr. 47 min. 53 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/19.0.0.0/grid/network/admin/listener.ora
Listener Log File         /u01/app/grid/diag/tnslsnr/exacs82-
vm3sv1/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
Services Summary...
Service "DB1_phx3g7" has 1 instance(s).
  Instance "DB11", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
  8. Search for the node to verify the listener.
    lsnrctl services | grep DB1
    The output will look similar to the following:
    Service "DB1_phx3g7" has 1 instance(s).
  Instance "DB11", status UNKNOWN, has 1 handler(s) for this service...
Service "DB1_phx3g7.datasubnetactiv.oscphevcn.oraclevcn.com" has 1 instance(s).
  Instance "DB11", status BLOCKED, has 1 handler(s) for this service...
[oracle@exacs82-vm3sv1 DB1]$ Connection to 10.255.195.131 closed by remote host.
  9. Start the Oracle Database Exadata Cloud Service instance.
    [oracle@exacs82-vm3sv1 ~]$ sqlplus / as sysdba
SQL> startup mount;

Configure SQL Net.Ora

Configure and copy the sqlnet.ora file to all the nodes of both the primary and standby Exadata instances, including grid home. The SQLNET.ora configuration must exist on the on-premises Oracle Exadata Database Machine and the Oracle Database Exadata Cloud Service.

The following is a snap shot of the values across the nodes.

The wallet file location must exist in the SQLNet.ora file on both the primary and standby Exadata instances. Ensure that there are no line breaks or white spaces in the SQLNET.ora file.

  1. Log into Oracle Home Node 1 of your primary, on-premises Exadata, then set your sqlnet.ora.
    [oracle@exa11db01 admin]$ cat sqlnet.ora
    The following is an example of the output.
    # sqlnet.ora.exa11db01 Network Configuration File: 
/u01/app/19.0.0.0/grid/network/admin/sqlnet.ora.exa11db01
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SQLNET.EXPIRE_TIME=10
SQLNET.ENCRYPTION_SERVER=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_SERVER=REQUIRED 
SQLNET.ENCRYPTION_TYPES_SERVER=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER=(SHA1) 
SQLNET.ENCRYPTION_CLIENT=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_CLIENT=REQUIRED 
SQLNET.ENCRYPTION_TYPES_CLIENT=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT=(SHA1)
ENCRYPTION_WALLET_LOCATION = 
 (SOURCE=
  (METHOD=FILE)
   (METHOD_DATA=
    (DIRECTORY=/u01/app/oracle/admin/db1/wallet/)))
  2. Log into Oracle Home Node 2 of your primary, on-premises Exadata, then set your sqlnet.ora.
    [oracle@exa11db02 admin]$ cat sqlnet.ora
    The following is an example of the output.
    # sqlnet.ora.exa11db01 Network Configuration File: 
/u01/app/19.0.0.0/grid/network/admin/sqlnet.ora.exa11db01
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SQLNET.EXPIRE_TIME=10
SQLNET.ENCRYPTION_SERVER=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_SERVER=REQUIRED 
SQLNET.ENCRYPTION_TYPES_SERVER=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER=(SHA1) 
SQLNET.ENCRYPTION_CLIENT=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_CLIENT=REQUIRED 
SQLNET.ENCRYPTION_TYPES_CLIENT=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT=(SHA1)
ENCRYPTION_WALLET_LOCATION = 
 (SOURCE=
  (METHOD=FILE)
   (METHOD_DATA=
    (DIRECTORY=/u01/app/oracle/admin/db1/wallet/)))
  3. Log into Grid Home Node 1 of your primary, on-premises Exadata, then set your sqlnet.ora.
    [oracle@exa11db01 admin]$ cat sqlnet.ora
    The following is an example of the output.
    # sqlnet.ora.exa11db02 Network Configuration File: 
/u01/app/19.0.0.0/grid/network/admin/sqlnet.ora.exa11db01
# Generated by Oracle configuration tools.
#(Default Values)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SQLNET.EXPIRE_TIME=10
  4. Log into Grid Home Node 2 of your primary, on-premises Exadata, then set your sqlnet.ora.
    [oracle@exa11db02 admin]$ cat sqlnet.ora
    The following is an example of the output.
    # sqlnet.ora.exa11db02 Network Configuration File: 
/u01/app/19.0.0.0/grid/network/admin/sqlnet.ora.exa11db02
# Generated by Oracle configuration tools.
#(Default Values)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SQLNET.EXPIRE_TIME=10
  5. Log into Node 1 of your standby Oracle Database Exadata Cloud Service, then set your sqlnet.ora.
    [oracle@exacs82-vm3sv1 DB1]$ cat sqlnet.ora
    The following is an example of the output.
    # sqlnet.ora.exa11db01 Network Configuration File: 
/u01/app/19.0.0.0/grid/network/admin/sqlnet.ora.exa11db01
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SQLNET.EXPIRE_TIME=10
SQLNET.ENCRYPTION_SERVER=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_SERVER=REQUIRED 
SQLNET.ENCRYPTION_TYPES_SERVER=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER=(SHA1) 
SQLNET.ENCRYPTION_CLIENT=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_CLIENT=REQUIRED 
SQLNET.ENCRYPTION_TYPES_CLIENT=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT=(SHA1)
ENCRYPTION_WALLET_LOCATION = 
 (SOURCE=
  (METHOD=FILE)
   (METHOD_DATA=
    (DIRECTORY=/var/opt/oracle/dbaas_acfs/DB1/wallet_root/tde)))
  6. Log into Node 2 of your standby Oracle Database Exadata Cloud Service, then set your sqlnet.ora.
    [oracle@exacs82-vm3sv2 DB1]$ cat sqlnet.ora
    The following is an example of the output.
    SQLNET.ENCRYPTION_TYPES_CLIENT = (AES256, AES192, AES128)
SQLNET.ENCRYPTION_SERVER = requested
SSL_CLIENT_AUTHENTICATION = FALSE
SQLNET.ENCRYPTION_CLIENT = requested
SSL_CIPHER_SUITES = (SSL_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 
SSL_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, SSL_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 
SSL_ECDHE_RSA_WITH_AES_256_GCM_SHA384)
SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT = (SHA256, SHA384, SHA512, SHA1)
HTTPS_SSL_VERSION = 1.2
SQLNET.WALLET_OVERRIDE = FALSE
SQLNET.EXPIRE_TIME = 10
WALLET_LOCATION = 
(SOURCE=(METHOD=FILE)(METHOD_DATA=(DIRECTORY=/var/opt/oracle/dbaas_acfs/grid/tcps_wall
ets)))
SQLNET.CRYPTO_CHECKSUM_CLIENT = accepted
SQLNET.CRYPTO_CHECKSUM_SERVER = accepted
SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER = (SHA256, SHA384, SHA512)
ENCRYPTION_WALLET_LOCATION = 
 (SOURCE=
  (METHOD=FILE)
   (METHOD_DATA=
    (DIRECTORY=/var/opt/oracle/dbaas_acfs/DB1/wallet_root/tde)))
SQLNET.ENCRYPTION_TYPES_SERVER = (AES256, AES192, AES128)
SQLNET.IGNORE_ANO_ENCRYPTION_FOR_TCPS = TRUE
SSL_VERSION = 1.2
  7. Log into Grid Home Node 1 of your standby Oracle Database Exadata Cloud Service, then set your sqlnet.ora.
    [grid@exacs82-vm3sv1 admin]$ cat sqlnet.ora
    The following is an example of the output.
    #SQLNET.ENCRYPTION_SERVER = requested
#SQLNET.ENCRYPTION_TYPES_CLIENT = (AES256, AES192, AES128)
#SSL_CLIENT_AUTHENTICATION = FALSE
#SQLNET.ENCRYPTION_CLIENT = requested
#SSL_CIPHER_SUITES = (SSL_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 
SSL_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, SSL_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 
SSL_ECDHE_RSA_WITH_AES_256_GCM_SHA384)
#SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT = (SHA256, SHA384, SHA512, SHA1)
#HTTPS_SSL_VERSION = 1.2
#NAMES.DIRECTORY_PATH = (TNSNAMES, EZCONNECT)
#SQLNET.EXPIRE_TIME = 10
#SQLNET.WALLET_OVERRIDE = FALSE
WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = 
/u02/app/oracle/admin/grid/grid_wallet)))
#SQLNET.CRYPTO_CHECKSUM_CLIENT = accepted
#SQLNET.CRYPTO_CHECKSUM_SERVER = accepted
#SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER = (SHA256, SHA384, SHA512, SHA1)
#SQLNET.ENCRYPTION_TYPES_SERVER = (AES256, AES192, AES128)
#SQLNET.IGNORE_ANO_ENCRYPTION_FOR_TCPS = TRUE
#SSL_VERSION = 1.2
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SQLNET.EXPIRE_TIME=10
SQLNET.ENCRYPTION_SERVER=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_SERVER=REQUIRED 
SQLNET.ENCRYPTION_TYPES_SERVER=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER=(SHA1) 
SQLNET.ENCRYPTION_CLIENT=REQUIRED 
SQLNET.CRYPTO_CHECKSUM_CLIENT=REQUIRED 
SQLNET.ENCRYPTION_TYPES_CLIENT=(AES256,AES192,AES128) 
SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT=(SHA1)
  8. Log into Grid Home Node 2 of your standby Oracle Database Exadata Cloud Service, then set your sqlnet.ora.
    [grid@exacs82-vm3sv2 admin]$ cat sqlnet.ora
    The following is an example of the output.
    SQLNET.ENCRYPTION_SERVER = requested
SQLNET.ENCRYPTION_TYPES_CLIENT = (AES256, AES192, AES128)
SSL_CLIENT_AUTHENTICATION = FALSE
SQLNET.ENCRYPTION_CLIENT = requested
SSL_CIPHER_SUITES = (SSL_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 
SSL_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, SSL_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 
SSL_ECDHE_RSA_WITH_AES_256_GCM_SHA384)
SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT = (SHA256, SHA384, SHA512, SHA1)
HTTPS_SSL_VERSION = 1.2
NAMES.DIRECTORY_PATH = (TNSNAMES, EZCONNECT)
SQLNET.EXPIRE_TIME = 10
SQLNET.WALLET_OVERRIDE = FALSE
WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = 
/u02/app/oracle/admin/grid/grid_wallet)))
SQLNET.CRYPTO_CHECKSUM_CLIENT = accepted
SQLNET.CRYPTO_CHECKSUM_SERVER = accepted
SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER = (SHA256, SHA384, SHA512, SHA1)
SQLNET.ENCRYPTION_TYPES_SERVER = (AES256, AES192, AES128)
SQLNET.IGNORE_ANO_ENCRYPTION_FOR_TCPS = TRUE
SSL_VERSION = 1.2

Update the Instance and Database Names on All Nodes

Change the instance and database names in the tnsnames.ora file on all nodes of the primary on-premises Exadata and the standby Oracle Database Exadata Cloud Service. Entries for each database are needed in both primary and standby tnsnames.ora files for proper redo transport.

In this example.

  • DB1: Primary on-premises Oracle Exadata Database Machine DB Name
  • db11: Database Instance Name on Node 1
  • db12: Database Instance Name on Node 2
  • DB1_phx3g7: Unique Oracle Database Exadata Cloud Service instance name.
  • DB11: Oracle Database Exadata Cloud Service instance Name 1 on Node 1
  • DB12: Oracle Database Exadata Cloud Service instance Name 2 on Node 2

If the primary database has a TNS entry in the on-premises tnsnames.ora file with a server name for the HOST, then change the server name in that entry to use the IP address for the host instead. IP addresses are used since there is no DNS between on-premises and cloud environments to resolve server names to IP addresses.

Oracle Real Application Clusters (Oracle RAC) configurations cannot resolve the scan listener name; therefore, you must use an address list that lists all nodes. Those will be added later, the initial instance should only list one IP in the TNS entries to ensure Oracle Recovery Manager (RMAN) is always connecting to the same nodes

Use the following example, replacing values relevant to the configuration.

  1. On Node 1 of your primary, on-premises Exadata, update the service name and instance name in your tnsnames.ora file.
    [oracle@exa11db01 admin]$ cat tnsnames.ora
    The following is an example of the output.
    # tnsnames.ora Network Configuration File: 
/u01/app/oracle/product/19.0.0.0/dbhome_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
DB1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 10.136.74.2)(PORT = 1522))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
     #(SERVICE_NAME = db1.service_name)
     (SERVICE_NAME = DB1)
      (INSTANCE_NAME = db11)
    )
  )
DB1_phx3g7 =
  (DESCRIPTION =
    (SDU = 65536)
    (RECV_BUF_SIZE = 134217728)
    (SEND_BUF_SIZE = 134217728)
    (ADDRESS_LIST =
      (CONNECT_TIMEOUT = 3)
      (RETRY_COUNT = 3)
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.255.195.136)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DB1_phx3g7.service_name)
      (UR = A)
    )
  )
  2. On Node 2 of your primary, on-premises Exadata, update the service name and instance name in your tnsnames.ora file.
    [oracle@exa11db02 admin]$ cat tnsnames.ora
    The following is an example of the output.
    # tnsnames.ora.exa11db02 Network Configuration File: 
/u01/app/oracle/product/19.0.0.0/dbhome_1/network/admin/tnsnames.ora.exa11db02
# Generated by Oracle configuration tools.
DB1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = exa11-scan1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = db1.service_name)
      (INSTANCE_NAME = db12)
    )
  )
DB1_phx3g7 =
  (DESCRIPTION =
    (SDU = 65536)
    (RECV_BUF_SIZE = 134217728)
    (SEND_BUF_SIZE = 134217728)
    (ADDRESS_LIST =
      (CONNECT_TIMEOUT = 3)
      (RETRY_COUNT = 3)
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.255.195.136)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DB1_phx3g7.service_name)
      (UR = A)
    )
  )
  3. On Grid Home Node 1 of your primary, on-premises Exadata, update the service name and instance name in your tnsnames.ora file.
    [oracle@exa11db01 admin]$ cat tnsnames.ora
    The following is an example of the output.
    DB1_phx3g7 = 
(DESCRIPTION = 
(SDU=65536) (RECV_BUF_SIZE=134217728) 
(SEND_BUF_SIZE=134217728) 
(ADDRESS_LIST = 
(CONNECT_TIMEOUT=3)(RETRY_COUNT=3)
(ADDRESS = (PROTOCOL = TCP)(HOST =10.255.195.131)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVER = DEDICATED) 
(SERVICE_NAME = DB1_phx3g7)
(INSTANCE_NAME=DB11) 
(UR=A) 
)) 
db1 = 
(DESCRIPTION = 
(SDU=65536) (RECV_BUF_SIZE=134217728) 
(SEND_BUF_SIZE=134217728) 
(ADDRESS_LIST = 
(FAILOVER=on)
(CONNECT_TIMEOUT=3)(RETRY_COUNT=3)
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.136.74.18)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVER = DEDICATED) 
(SERVICE_NAME = db1) 
(UR=A) 
))
  4. Log into Node 1 of your standby Oracle Database Exadata Cloud Service, then update the service name and instance name in your tnsnames.ora file.
    [oracle@exacs82-vm3sv1 DB1]$ cat tnsnames.ora
    The following is an example of the output.
    DB1_phx3g7 =
  (DESCRIPTION =
    (SDU = 65536)
    (RECV_BUF_SIZE = 134217728)
    (SEND_BUF_SIZE = 134217728)
    (ADDRESS_LIST =
      (CONNECT_TIMEOUT = 3)
      (RETRY_COUNT = 3)
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.255.195.136)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DB1_phx3g7.service_name)
      (INSTANCE_NAME = DB11)
      (UR = A)
    )
  )
db1 = 
(DESCRIPTION = 
(SDU=65536) (RECV_BUF_SIZE=134217728) 
(SEND_BUF_SIZE=134217728) 
(ADDRESS_LIST = 
(FAILOVER=on)
(CONNECT_TIMEOUT=3)(RETRY_COUNT=3)
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.136.74.18)(PORT = 1521))  
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = db1.service_name)
      (INSTANCE_NAME = DB11)
      (UR = A)
    )
  )
  5. In Node 2 of your standby Oracle Database Exadata Cloud Service, update the service name and instance name in your tnsnames.ora file.
    [oracle@exacs82-vm3sv2 DB1]$ cat tnsnames.ora
    The following is an example of the output.
    db1 = 
(DESCRIPTION = 
(SDU=65536) (RECV_BUF_SIZE=134217728) 
(SEND_BUF_SIZE=134217728) 
(ADDRESS_LIST = 
(CONNECT_TIMEOUT=3)(RETRY_COUNT=3)
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.136.74.18)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVER = DEDICATED) 
(SERVICE_NAME = db1.service_name) 
(UR=A) 
)
         ) 
DB1_phx3g7 =
  (DESCRIPTION =
    (SDU = 65536)
    (RECV_BUF_SIZE = 134217728)
    (SEND_BUF_SIZE = 134217728)
    (ADDRESS_LIST =
      (CONNECT_TIMEOUT = 3)
      (RETRY_COUNT = 3)
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.255.195.136)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DB1_phx3g7.service_name)
      (INSTANCE_NAME = DB12)
      (UR = A)
    )
  )
  6. Log into Grid Home Node 1 of your standby Oracle Database Exadata Cloud Service, then set your sqlnet.ora.
    [grid@exacs82-vm3sv1 admin]$ cat tnsnames.ora
    The following is an example of the output.
    DB1_phx3g7 = 
(DESCRIPTION = 
(SDU=65536) (RECV_BUF_SIZE=134217728) 
(SEND_BUF_SIZE=134217728) 
(ADDRESS_LIST = 
(CONNECT_TIMEOUT=3)(RETRY_COUNT=3)
(ADDRESS = (PROTOCOL = TCP)(HOST =10.255.195.131)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVER = DEDICATED) 
(SERVICE_NAME = DB1_phx3g7)
(INSTANCE_NAME=DB11) 
(UR=A) 
)) 
db1 = 
(DESCRIPTION = 
(SDU=65536) (RECV_BUF_SIZE=134217728) 
(SEND_BUF_SIZE=134217728) 
(ADDRESS_LIST = 
(FAILOVER=on)
(CONNECT_TIMEOUT=3)(RETRY_COUNT=3)
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.136.74.18)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVER = DEDICATED) 
(SERVICE_NAME = db1.service_name) 
(UR=A) 
))

Set the TCP Socket Size

Set the TCP socket size to a maximum of 128MB for the on-premises system and the cloud instance for optimal transport performance. If the values between the on-premises and cloud instances don't match, the network protocol will negotiate the lower of the two values.

  1. As a root user, check the TCP socket size for the on-premises system.
    /sbin/sysctl -a | egrep net.core.[w,r]mem_max
    The output will look similar to the following:
    net.core.rmem_max = 4194304 
net.core.wmem_max = 2097152
  2. As a root user, check the TCP socket size for the cloud instance.
    /sbin/sysctl -a | egrep net.core.[w,r]mem_max
    The output will look similar to the following:
    net.core.rmem_max = 134217728
net.core.wmem_max = 134217728
  3. If the TCP socket size of your cloud instance is not 128MB or 134217728, then edit the /etc/sysctl.conf file settings for net.core.wmem_max and net.core.rmem_max to 134217728.