| 摘要 |
A database is provided in which conclusion sets (20, 22, 24, 26, 28 and 30) are divided into a hierarchical series of levels (level 1, level 2, level 3). Data is added to a conclusion set at the first level (level 1) until such time as that conclusion set is full. Data is then migrated from the conclusion set (20) to its subordinate conclusion sets (24, 26) therefore reducing the amount of disc access required to add data to the database since multiple entries are migrated in relatively few disc access operations.
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