| 摘要 |
A coarse database index, and system and method of use therefor, that will quickly indicate which data partitions of a table contain a given key. Once the target data partitions are located, the exact record locations can be found using traditional indexes. The coarse indexes take little space, can be updated quickly, and searched quickly. The coarse index is in conjunction with a database including a plurality of data partitions. Each data partition includes data, including a plurality of key values of at least one key, and at least one dense index referencing the data. The coarse index indexing the plurality of key values according to data partitions containing each key value. The coarse index includes a first bitmap, which is preferably arranged in key value major format. The coarse index may also include a second bitmap, which is preferably arranged in data partition major format. The second bitmap may be transformed from data partition major format to key value major format. The first and second bitmap partitions may be compressed.
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