| 摘要 |
generating information necessary for real time retrieval; obtaining a physical start address of a tuple; checking whether a relative order value of the tuple exists within the range of a corresponding relation, if it does not exist, reporting an error, and if it exists, checking whether there is a tuple to be retrieved; and if it does not exist, reporting an error, and if it exists, copying the tuple and reporting a retrieval result, thereby shortening a retrieving time.
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