The patent's inventors are
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention relates to stream data generating methods, stream data generating devices, and a recording medium storing stream data generating program, and more particularly, to a stream data generating method, a stream data generating device, and a recording medium storing stream data generating program for generating stream data in a stream data processing system.
"In these years, a demand for a stream data processing system, which receives a large quantity of data (stream data) incoming at all times and processes the received data on real time basis, is increasing. For example, with respect to a financial application program for supporting stock transaction, one of most important objects of the application is to quickly cope with a variation in stock price. In this connection, when a prior art database management system (DBMS) processes data, the system is required to store the received stock data once in a storage. If the system treats a larger quantity of stock data in future, then it may possibly become difficult for the system to cope with a variation in stock price or the like on a real time basis.
"Further, when an application program for processing such stream data on a real time basis is separately created, this involves problems with a prolonged development term, an increased development cost, and difficult quick coping with a change in business using the application. To this reason, a general-purpose stream data processing system has been demanded.
"In the stream data processing system, a query (inquiry) is first register in the system, and the query is continually executed together with arrival of stream data. However, since such stream data arrives from time to time, it is impossible for the system to start processing all the data after already arrived. Further, the data arrived in the system are required to be processed according to their arrival order while not influenced by a data processing load.
"In a technique disclosed in
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