Implementation & Computation of DW and Data Cube. Remember: ....What is OLAP?. The term OLAP („online analytical processing“) was coined in a white paper written for Arbor Software Corp. in 1993. Data Cube, Storage space Partial, total and no materialization (precomputation)
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Implementation & Computation of DW and Data Cube
()
(city)
(item)
(year)
(city, item)
(city, year)
(item, year)
(city, item, year)
1) {year, item_name, city}
2) {year, brand, country}
3) {year, brand, province_or_state}
4) {item_name, province_or_state} where year = 2000
Base table
Index on Region
Index on Type
In data warehouses, join index relates the values of the dimensions of a start schema to rows in the fact table.
C
c3
61
62
63
64
c2
45
46
47
48
c1
29
30
31
32
c 0
B
60
13
14
15
16
b3
44
28
56
9
b2
B
40
24
52
5
b1
36
20
1
2
3
4
b0
a0
a1
a2
a3
A
What is the best traversing order to do multi-way aggregation?
C
c3
61
62
63
64
c2
45
46
47
48
c1
29
30
31
32
c 0
B
60
13
14
15
16
b3
44
28
56
9
b2
40
24
52
5
b1
36
20
1
2
3
4
b0
a0
a1
a2
a3
A
B
C
c3
61
62
63
64
c2
45
46
47
48
c1
29
30
31
32
c 0
B
60
13
14
15
16
b3
44
28
B
56
9
b2
40
24
52
5
b1
36
20
1
2
3
4
b0
a0
a1
a2
a3
A
HAVING COUNT(*) >= minsup
SelExp
InExp