Join operations in hybrid main memory systems

摘要

Implementations of the present disclosure include methods, systems, and computer-readable storage mediums for receiving an annotated query execution plan (aQEP), the aQEP being processed to execute a query on an in-memory database in a hybrid memory system, and including one or more annotations, each annotation indicating an output of a respective operator that is to be provided as input to a join operator, determining a payload size at least partially based on an estimated size of an intermediate output of the join operator, selecting a memory type from a plurality of memory types in the hybrid memory system based on the payload size and a cache size, and storing, after execution of the aQEP, the intermediate output on the memory type in the hybrid memory system.