Database scripts for estimating growth

One of the simplest scripts is based on addition of datafiles and is described in metalink note 135294.1

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Script:
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select to_char(creation_time, 'RRRR Month') "Month",
sum(bytes)/1024/1024
"Growth in Meg"
from sys.v_$datafile
where creation_time > SYSDATE-365
group by to_char(creation_time, 'RRRR
Month');


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Sample Output from the script:
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Month
Growth in
-------------------------------- ----------
2000 December 1068.625
2001 February 70