HA/DR operations - SAP NetWeaver on Amazon
Oracle Data GuardPerform a DNS change
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HA/DR operations

Oracle Data Guard

You can use manual failover or switchover to the standby database using steps described in the Switchover and Failover Operations. You can also automate this process by following the steps in Oracle Data Guard Fast-Start Failover. When using this feature with the observer node, you must place the observer node in the third Availability Zone. Ensure that you have the license to use the fast-start failover, it may not be included with the Data Guard. You can also use supported third-party products that provide automatic failover operation with the Data Guard. To reconnect the SAP applications post-failover, see the Reconnect SAP instance to database section-premises in https://www.sap.com/documents/2016/12/a67bac51-9a7c-0010-82c7-eda71af511fa.html.

Data Guard Broker switch over

Perform a DNS change

In case of manual failover, you may install SAP application servers using a virtual hostname and perform a DNS change to direct the SAP application servers to the new primary database server. For a DNS resolution in Amazon, you can use any of the following options.

  • Amazon Route 53 enables you to create a private hosted zone for your environment and an A record for the virtual hostname used for Oracle database. Initially, this A record is mapped to the IP address of the primary Oracle database instance.

  • You can maintain your own DNS server on-premise or on your Amazon EC2 instances. You can create an A record there for your virtual hostname used for Oracle database. Initially, this A record is mapped to the IP address of the primary Oracle database instance.

With any of the previously mentioned options, you can change the A record to a private IP address of the primary database instance in case of a failover. This DNS change can also be automated using Amazon services and scripts.