Patent ID: 7403959
Filing Date: 2008-07-22
Classification: G06F,Y10S

Abstract:
1. A query processing method for a stream data processing system in which at least one query for performing data process on the stream data is registered and the registered query is executed to process the data stream received from at least one stream data source, the method comprising: preparing a first query for a real time data processing which stores the received stream data in a buffer and continuously executes the data process on the data in the buffer and a second query for an archive data processing which acquires archive data and executes the data process on the acquired archive data; archiving some or all of the received stream data into a non-volatile storage medium as the archive data while executing the first query; and when the stream data cannot be processed by the first query, switching from the first query to the second query to acquire the archive data from the non-volatile storage medium to execute the data process on the acquired archive data.