Getting the size of all databases in a grid?

Hi,
We currently using Oracle Enterprise Manager 10g to look after a large number of databases. I have been asked to gather information about them all including their current size.
Is anyone able to advise me of the best way to do this? I tried goggling and searching the forum but have not managed to find anything yet.
I have tried creating a 'Oracle Database Space Usage' report within enterprise manager to give me the database size. I can get the allocated, used and allocated free space for a single database but not all of them in one report. I have also been told that I should be able to get this information from the sysman schema. I have found some sites describing how to get other info from here but not the database size.
I know this is probably a fairly basic question but I am still very new to enterprise manager. Any advice or pointers to relevant docs that I can read would be greatly appreciated.
Thanks,
Andrew.

You could (at least in EM 11g) create a database group or groups and use the report Oracle Database Space Usage (Group)
Or create your own report like Oracle Database Current Space Usage, description "Displays current space usage details for the tablespaces in all Oracle Database"
General:
Catagory - storage
Subcatagory - Oracle Database Space Usage
Targets:
Use the spicified target
Elements
Type - Database table from SQL
Set Parameters
Stattement:
select target_name DB_NAME,host_name Host,sum(trunc(tablespace_size/1024/1024/1024,2)) size_GB_Bruto,
sum(trunc(tablespace_used_size/1024/1024/1024,2)) size_GB_Netto,
(trunc((sum(tablespace_size) - sum(tablespace_used_size))/1024/1024/1024,1)) GB_Verschil
from MGMT$DB_TABLESPACES
group by host_name,target_name
order by host_name,target_name
Statement Type: SQL
Rows to display in Table: 200
Succes,
Eric

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