| 摘要 |
PROBLEM TO BE SOLVED: To provide a database management system, capable of storing XML block data as they are. SOLUTION: A data group storing means 5 stores data about a plurality of attribute items and also stores a plurality of pieces of block data, in which each attribute item is determined structurally. An auxiliary data storing means 7 stores retrieval auxiliary data including the existence position information of data belonging to each attribute item of the plurality of block data. When a retrieval instruction which includes an attribute item to be retrieved is given, a retrieving means 3 refers to the retrieval auxiliary data stored in the means 7 and retrieves the data stored in the means 5. Thus, it is possible to perform high-speed data retrieval even though the plurality of block data, in which each attribute item is structurally determined are stored as they are.
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