| US 7,483,907 B2 | ||
| Processing data-stream join aggregates using skimmed sketches | ||
| Sumit Ganguly, Bhopal (India); Minos Garofalakis, Morristown, N.J. (US); and Rajeev Rastogi, New Providence, N.J. (US) | ||
| Assigned to Alcatel-Lucent USA Inc., Murray Hill, N.J. (US) | ||
| Filed on Dec. 29, 2004, as Appl. No. 11/25,578. | ||
| Prior Publication US 2006/0143170 A1, Jun. 29, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G06F 17/30 (2006.01) | ||
| U.S. Cl. 707—101 [707/2; 707/6; 707/100] | 14 Claims |
| 1. A method of estimating a join aggregate over one or more data-streams, the method comprising the steps of:
maintaining one or more atomic sketches over said one or more data-steams;
skimming dense frequencies from said atomic sketches, thereby creating a dense frequency vector and an atomic skimmed-sketch
for each of said one or more data-streams, and;
generating an atomic estimate of said join aggregate using said atomic skimmed-sketches and said dense frequency vectors and
storing said atomic estimate in a computer memory as an approximation of a size of said join aggregate.
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