Selective In-Place Appends for Real: Reducing Erases on Wear-prone DBMS Storage

In the present paper we demonstrate the novel technique to apply the recently proposed approach of In-Place Appends - overwrites on Flash without a prior erase operation. IPA can be applied selectively: only to DB-objects that have frequent and relatively small updates. To do so we couple IPA to the concept of NoFTL regions, allowing the DBA to place update-intensive DB-objects into special IPA-enabled regions. The decision about region configuration can be (semi-)automated by an advisor analyzing DB-log files in the background.