SAP HANA Platform vs. Disk-Based Database with In-Memory Cache
YES - Because all hot data is automatically in-memory.
Disk-Based Database with In-Memory Cache
No - Because only pre-selected data is copied in-memory
Users are limited in the granularity of their real-time data analysis since disk-based databases are architected to manage data on disk and use a combination of add-on in-memory caches, indexes, pre-aggregates and materialized views to accelerate performance. For better performance the DBA has to duplicate data on in-memory caches and create data structures for data on disk before users can perform drill-downs. Additionally, if the size of the in-memory cache cannot accommodate all the required data, the DBA has to resize the system and potentially restart it.
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