Which recovery strategy has a high cost associated with it in SAP HANA?

The recovery strategy that has a high cost associated with it in SAP HANA is storage replication. This method involves maintaining a synchronous or asynchronous copy of data on a separate storage system, which can require significant investment in hardware, software, and possibly licensing costs.

Storage replication is aimed at ensuring data availability and protection against data loss or corruption. This can involve high-performance storage systems and significant infrastructure, which can translate to higher operational and maintenance costs. Additionally, the performance impact of constantly synchronizing data across locations can result in increased resource consumption, necessitating more powerful hardware and greater oversight.

The other strategies tend to have lower associated costs in comparison. Database backups, while essential, typically involve periodic snapshots of the database that can reside on existing storage solutions. System replication focuses on duplicating the entire system setup on another server, which incurs costs but often utilizes existing infrastructures. Service auto-restart, in contrast, is a feature designed to increase availability with minimal cost implications, as it primarily leverages the existing system's capabilities to recover services without substantial additional investment.