Checking the size of the infocube

Hi,
How can we check the size of the infocube with large volume of data? From the SAP standard practice what is the optimal size that an infocube can consist of data with out an impact on the query performance?

Hi
When estimating the size of an InfoCube one must consider the size of the fact table and dimension tables. However, the size of the fact table is the most important, since in most cases it will be 80-90% of the total storage requirement for the InfoCube.
The following shows how to calculate the size of an InfoCube, including the dimension tables and the fact tables.
Size of a dimension table
To calculate the size of a dimension table:
u2022     The size of one record of the dimension table can be calculated by summing the number of characteristics in the dimension table at 4 bytes each. Also, add four bytes for the key of the dimension table.
u2022     Calculate the number of records in the dimension table
u2022     Multiply the size of 1 record by the number of records
Assume that the dimension table indexes will take up as much space as the dimension table itself.
Size of a Fact Table
To calculate the size of a fact table:
u2022     Count the number of key figures the table will contain, assuming a quantity key figure requires 9 bytes, a currency key figure requires 9 bytes, and other numeric fields require 4 bytes (or more).
u2022     Every dimension table requires a foreign key in the fact table, so add 4 bytes for each key. Donu2018t forget the three standard dimensions.
u2022     Add these figures together to get the size of 1 record
u2022     Calculate the number of records in the fact table
u2022     Multiply the size of 1 record by the number of records
Assume that the fact table indexes will take up as much space as the fact table itself. This is more index space than is usually required in most OLTP systems. In the fact table, many of the columns will be foreign keys with pointers to dimension tables. Each of them will have an index.
Add an additional 150% for temporary table space and aggregate tables. An aggregate contains both new dimension and data tables. A rule of thumb is that all the aggregates will be the size of the fact table.
Hope this Helps
Regards
Shilpa

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