Estimate db size and change tablespace configuration before restoring RMAN

Hi,
I am wondering whether it is possible to estimate the size of the restored database just from the RMAN files I have?
Also, Is there a setting I can change in these files to disable 'autoextend' feature in the tablespace of the restored database?
thank you in advance.

Hi
But using this method I will damage the existing control file of the original server.
SQL 'alter database mount';
sql statement: alter database mount
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of sql command on default channel at 09/16/2009 17:18:59
RMAN-11003: failure during parse/execution of SQL statement: alter database mount
ORA-01103: database name 'OLD_DB' in control file is not 'JUPITER'
And when I start JUPITER:
startupORACLE instance started.
Total System Global Area 192937984 bytes
Fixed Size 2169752 bytes
Variable Size 134079592 bytes
Database Buffers 54525952 bytes
Redo Buffers 2162688 bytes
ORA-00205: error in identifying control file, check alert log for more info
Is there a way to restore the control file without damaging the existing server?
thank you for your support.

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Estimate db size and change tablespace configuration before restoring RMAN

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