| 摘要 |
A computer implemented method, involving a database management system, retrieves information from a data structure in a memory of a computer system. A user process specifies in a database query language statement a key value used to directly access the information, rather than sequentially searching the entire data structure for the information. A database management system process uses the value to find a location in the data structure at which said information is stored and maps the location in the data structure to a memory address in memory at which the information corresponding to the value is stored. The database management system process retrieves the information from the data structure in memory beginning at the memory address and provides the information to the user process in response to the database query language statement.
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