How is high availability achieved in SAP HANA?

High availability in SAP HANA is primarily achieved through the creation of a replication system between primary and secondary nodes. This method ensures that data is continuously synchronized between the two nodes, which helps maintain operational continuity even in the event of hardware or software failures on the primary site.

By having a secondary node in place that can take over operations if the primary node fails, SAP HANA minimizes downtime and provides a seamless experience for users. This replication process includes mechanisms such as synchronous and asynchronous replication, which allows for flexible configurations based on the business needs. If one node fails, the system can quickly and reliably switch to the secondary node, ensuring that the services remain uninterrupted.

While implementing a robust firewall system, using data encryption techniques, and conducting regular system audits are all beneficial practices within the broader context of system security and maintenance, they do not directly contribute to achieving high availability in SAP HANA. High availability specifically focuses on ensuring that the database remains accessible and operational despite potential disruptions, which is why the replication system is the key component.