We often see cases where the customer is concerned about the size of their database, the amount of physical disk it is actually occupying. Most available solutions show data file or tablespace sizes, leaving the user with a math problem to solve.
Run the following script from SQLPlus as SYS as SYSDBA (not as protect or the DLP schema owner):
(select sum(bytes) from dba_data_files)/1024/1024/1024 db_size
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