SAP HANA Platform vs. Disk-Based Database with In-Memory Cache
YES - Transactions and queries performed on same data in-memory
Disk-Based Database with In-Memory Cache
NO - The in-memory cache is not a database, it is just a read-only cache.
Disk-based databases with an in-memory cache typically process transactions (update, insert or delete operations) on disk and then update the data in the in-memory cache to ensure read consistency. Applications that perform both transactions and queries would have to wait for transactions to complete on disk before accessing the updated data in the cache. Since disk access is much slower than memory access these applications will experience delays.
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