The effect of cube and rollup function

1. For under 500,000 in Oracle 9i, rollup is faster than cube.
But above 1,000,000, cube is faster than rollup.
Right?
2. Why do rollup(a) and cube(a) all have a parameter?
3. Under only one parameter, the compute process of cube and rollup is not the same, right?
Thx.

>
1. For under 500,000 in Oracle 9i, rollup is faster than cube.
But above 1,000,000, cube is faster than rollup.
Right?
>
Rollup summarises data differently to cube, so to say one is faster or slower than the other is not a question one should consider necessarily.
The main consideration should be in what format you would like the result set to be in.
http://download.oracle.com/docs/cd/E11882_01/server.112/e16579/aggreg.htm#DWHSG8609
http://download.oracle.com/docs/cd/E11882_01/owb.112/e10935/dim_objects.htm#WBETL03002
>
2. Why do rollup(a) and cube(a) all have a parameter?
>
The parameter(s) refers to the Grouping against which the data is summarised.
The Oracle documentation states the following:
>
CUBE takes a specified set of grouping columns and creates subtotals for all of their possible combinations
>
So both rollup and cube could summarise across a group of column(s).
>
3. Under only one parameter, the compute process of cube and rollup is not the same, right?
>
Correct, depends what you want to summarise against.

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