AGGREGATE QUERY-CACHING IN DATABASES ARCHITECTURES WITH A DIFFERENTIAL BUFFER AND A MAIN STORE

The invention relates to a computer system for both online transaction processing and online analytical processing, comprising: a processor coupled to a database, the database comprising the database comprising: a main store (116) for storing records, a differential buffer (114) for receiving and buffering added or deleted or modified records, the differential buffer being coupled to the main store, a schema comprising records stored in the main store and records stored in the differential buffer, and a cache store (112) for caching a result of a query against the schema; and a cache controller (106) executable by the processor and communicatively coupled to the database, the cache controller being configured for: storing the result of the query in the cache store; receiving an analytical request; and determining, in response to the received request, an up-to-date result of the query by (216): accessing the cache store to obtain the cached result; determining the records of the schema that have been added or deleted or modified since the step of storing the cached result in the cache store on the basis of the records stored in the differential buffer; and incrementally deriving the up-to-date result from the cached result and from the records determined in the previous step.