I am upgrading Oracle 8i to Oracle 10g for my client. A shared storage (EMC Disk system) wil be used for the upgrade.

The database size for Oracle 8i is 80GB. (all files under oradata)

I would like to know, will the database size remain more or less the same after data migrated to Oracle 10g (i.e. The database size for Oracle 10g is approx. to 80GB)?

I need this figure to calculate the disk space for the EMC Disk System.
Thank you very much if anyone could help!!!