Patent ID: 9519673
Filing Date: 2016-12-13
CPC Classification: G06F

Claim Text:
1. A method for a database system comprising a first instantiation of a columnar table in a volatile memory and a second instantiation of the columnar table in a persisted memory, the method comprising: receiving a transaction to change the columnar table; recording the transaction within a delta structure in the volatile memory; recording the transaction within a log of the persisted memory; receiving an instruction to merge the delta structure in the volatile memory with the first instantiation of the columnar table in the volatile memory; in response to the instruction, merging the delta structure in the volatile memory with the first instantiation of the columnar table in the volatile memory to create a merged columnar table in the volatile memory, and not storing the merged columnar table in the persisted memory; receiving an instruction to execute a savepoint; and in response to the instruction to execute the savepoint, copying the delta structure in the volatile memory to the persisted memory, and copying the merged columnar table in the volatile memory to the persisted memory.