APPARATUS AND METHOD FOR CONTINUOUS QUERY PROCESSING USING THE SHARING OF OPERATION AMONG MULTIPLE QUERIES ON XML DATA STREAM

摘要

A device and a method for processing continuous queries sharing a result of the queries for an XML(extensible Markup Language) data stream are provided to improve continuous query processing performance with reduction of repeated operation by sharing the result for common operation shared among the continuous queries. A syntax analyzer(520) checks a syntax error by receiving continuous queries registered from an external application/user(510), checks a semantic error of a syntax analysis result received from the syntax analyzer, and transfers a semantic analysis result. A semantic analyzer(530) checks a semantic error of the syntax analysis result received from the syntax analyzer and transfers the semantic analysis result. A sharable operation extractor(540) extracts operations sharable among a plurality of continuous queries and stores a result of the extracted sharable operation separately. A query executor(550) executes the continuous query for an XML data stream by using a sharable operation result while rounding the semantic analysis result and outputs the result to the outside.