After performing an upgrade of the primary system, what manual action must be taken for SAP HANA system replication?

When upgrading the primary SAP HANA system, it is essential to perform manual synchronization steps for the system replication to ensure that the secondary systems are in sync with the upgraded primary system. During the upgrade process, important changes may occur within the database structure, configurations, or even system parameters.

These changes necessitate manual synchronization actions, which typically involve confirming that the secondary system recognizes and adopts these updates. If these steps are neglected, the secondary system could fall out of sync, leading to inconsistencies in the data and potentially affecting the overall reliability and performance of the replicated system.

The other options, while they may seem relevant in different contexts, do not directly pertain to the specific requirements following an upgrade in SAP HANA system replication. For instance, network settings might only need adjustments if there were changes to connectivity during the upgrade, and restarting the primary system is not typically required as part of post-upgrade steps specifically related to replication. User permissions may need updates over time, but they are not directly connected to the upgrade process of system replication. Thus, performing manual synchronization steps is the critical action required after a primary system upgrade to maintain system integrity and consistency in HANA system replication.