SAP HANA Platform vs. Disk-Based Database with In-Memory Cache
YES - Predictable response times
Disk-Based Database with In-Memory Cache
NO - No predictable response times
Disk-based databases are architected to manage data on disk and use add-on in-memory caches to accelerate access to portions of data. Only queries that exclusively access cached data can return results in a predictable time. All other queries experience delays because access times depend on parameters such as where the data is placed on disk, which indexes are used, and the number of parallel processes accessing the disk. Ad-hoc
queries will experience unpredictable response times when some or all of the data required is available only on disk.
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