How to estimate size of dimension & cube

Hi,
Is there any guideline avialable to estimate the space required for a dimension or for a cube? I mean if a dimension table is of 200GB, how much space I will be needing to create a dimension in analytic workspace?
Also, when we refresh the dimension/cube, are used spaces freed and re-used?
Thanks a lot in advance for your help.
AKG

You could try using the new 10g diagnostisc tuning advisor : ADDM
In SQLPlus do the following:
1) exec dbms_workload_repository.create_snapshot();
2) run your AWM build
3) exec dbms_workload_repository.create_snapshot();
4) run the following script:
set long 1000000
set pagesize 50000
column get_clob format a80
spool tuning_report.txt
select dbms_advisor.get_task_report(task_name, 'TEXT', 'ALL')
as ADDM_report
from dba_advisor_tasks
where task_id=(
select max(t.task_id)
from dba_advisor_tasks t
, dba_advisor_log l
where t.task_id = l.task_id
and t.advisor_name='ADDM'
and l.status= 'COMPLETED');
spool off
this will generate something like the following:
FINDING 1: 100% impact (343 seconds)
Significant virtual memory paging was detected on the host operating system.
RECOMMENDATION 1: Host Configuration, 100% benefit (343 seconds)
ACTION: Host operating system was experiencing significant paging but no
particular root cause could be detected. Investigate processes that
do not belong to this instance running on the host that are consuming
significant amount of virtual memory. Also consider adding more
physical memory to the host.
RECOMMENDATION 2: DB Configuration, 100% benefit (343 seconds)
ACTION: Total PGA memory used was above the specified
"pga_aggregate_target" value for 26% of the time. Consider increasing
your current "pga_aggregate_target". Note that the sum of
"pga_aggregate_target" and SGA size should be less than the physical
memory available on the host.
RATIONALE: The value of parameter "pga_aggregate_target" was "107 M"
during the analysis period.
These are a good starting point before turning the Oracle database tuning guide.
Hope this helps
Keith Laker
Data Warehouse Solution Architect
Oracle EMEA Consulting
BI Blog : http://oraclebi.blogspot.com
DM Blog : http://oracledmt.blogspot.com

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How to estimate size of dimension & cube

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