Data indexing system, data indexing method and data querying method
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United States of America Patent
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Mar 1, 2016
Grant Date -
Sep 26, 2013
app pub date -
Dec 12, 2012
filing date -
Mar 23, 2012
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Abstract
A data indexing system is provided. The system includes: a time interval splitting unit configured to split a predetermined time range into a plurality of time intervals. A first index creating unit is configured to create a first-level index for data in a current time interval, the first-level index including a time interval index and a subspace index. A second index creating unit is configured to create, in a time interval after the current time interval, a second-level index for data in the current time interval. The second-level index has a finer granularity than the first-level index. A data indexing method and a data querying method are also provided. The cost for index maintenance can be greatly reduced in a case of frequent updates. Further, invalid scans during the query process can be reduced and the query performance can be improved.
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