Efficiently Making Cross-Engine Transactions Consistent

Database systems are becoming increasingly multi-engine. In particular, a main-memory engine may coexist with a traditional storage-centric engine in a system to support various applications. It is desirable to allow applications to access data in both engines using cross-engine transactions. But existing systems are either only designed for singleengine accesses, or impose many restrictions by limiting crossengine transactions to certain isolation levels and operations. The result is inadequate cross-engine support in terms of correctness, performance and programmability.