Lower Kent Ridge Road, Singapore 119260. TRA7/01. Adaptive Pre-computed Partition Top ... at the address shown on the cover. Ivan PNG. Dean of School ...
THE
NATIONAL UNIVERSITY of SINGAPORE
Founded 1905
School of Computing Lower Kent Ridge Road, Singapore 119260
TRA7/01 Adaptive Pre-computed Partition Top Method for Range Top-k Queries in OLAP Data Cubes Zheng Xuan LOH, Tok Wang LING, Chuan Heng ANG, Sin Yeung LEE and Hua-Gang LI
July 2001
Technical Report Foreword
This technical report contains a research paper, development or tutorial article, which has been submitted for publication in a journal or for consideration by the commissioning organization. The report represents the ideas of its author, and should not be taken as the official views of the School or the University. Any discussion of the content of the report should be sent to the author, at the address shown on the cover.
Ivan PNG Dean of School
d =4, n =100
d =4, n =100, b =10 25 r=3
Average Response Time (s)
Average Response Time (s)
580
560
540
520
500
20
r=5 r=7
15
r = 10
10 5 0
0
40
80
120 Top-k
(a) Naïve Method
160
200
0
40
80
120
160
Top- k
(b) A P P T Method using only L P C
200
d =4, n =100, b =10 2.5
Average Response Time (s)
r = 3, f = 7
2
r = 5, f = 5 r = 7, f = 3
1.5
r = 10, f = 0
1 0.5 0 0
40
80
120
160
200
Top- k
n =100, d =4, b =10
Extra Storage Requirement (MB)
1.2 1
OA LPC
0.8 0.6
1 : r = 3, f = 7 0.4
2 : r = 5, f = 5 3 : r = 7, f = 3
0.2
4 : r = 10, f = 0
0
1 2 3 4 Top-20
1 2 3 4 Top-60
1 2 3 4 Top-100
1 2 3 4 Top-200
n = 1 0 0 , d =4, b =10, r =5, f = 5
Average Response Time (s)
3 LPC only
2.5 2
LPC + OA
1.5 1 0.5 0 0
40
80
120 Top- k
160
200
