What two features of the storage engine in the SAP HANA index server enable data consistency and maintain durable changes?

The two features of the storage engine in the SAP HANA index server that enable data consistency and maintain durable changes are indeed related to Page Management and Logger.

Page Management plays a crucial role in ensuring that the data is organized and managed efficiently within the memory and disk storage. It helps in maintaining the consistency of data by managing how data pages are written to and read from storage. This involves the control of memory allocation and the handling of data pages to reflect the current state of data while enabling quick access and modifications.

The Logger, on the other hand, captures all changes made to the data in a transactional manner. This ensures that even in the event of a power failure or system crash, any committed changes can be recovered from the log. The Logger maintains a record of modifications, which is essential for durability, as it prevents data loss and allows the system to restore to a consistent state after any interruptions.

Together, these features work effectively to provide the necessary mechanisms for consistency and durability in the management of data within SAP HANA.