The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 2001
Filed:
Sep. 30, 1998
Sridhar Ramaswamy, Scotch Plains, NJ (US);
Torsten Suel, Springfield, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
I/O-efficient methods and apparatus are provided for the d-dimensional join problem in one, two, and three dimensions, and are also generalized for arbitrary higher dimensions. Let N be the total number of rectangles in the two sets to be joined, M the total amount of memory available, B the disk block size, and T the total number of pairs in the output of the join. Define n=N/B, m=M/B, and t=T/B. For one and two dimensions, I/O-optimal join methods are provided that run in O(nlog,n+t) I/O operations and have utility to temporal and spatial database systems. For dimensions d≧3, methods are provided that run in O(nlog,n+t) I/O operations, which is within a log,n factor of the currently known lower bounds.