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Opening recovered database with UPGRADE option

I have a backup of an Oracle 8i database which I needed to restore on Oracle 10g Server. I created a new database on the server, placed all the datafiles and redo logs and then re-created the controlfile and did a recover database using the backup controlfile. When I open the database I get "ORA-01092: ORACLE instance terminated. Disconnection forced." I traced the log file and got "ORA-00704: bootstrap process failure" and "ORA-39700: database must be opened with UPGRADE option." I don't understand why I have to upgrade and how?

I have a backup of an Oracle 8i database (not sure which release) which I needed to restore on Oracle 10g Server (10.1.0.3.0). I created a new database on the server using the database assistant, placed all the datafiles and redo logs and then re-created the controlfile and did a recover database using the backup controlfile. It worked and I got the message "log applied, media recovery complete." However when I open the database I get "ORA-01092: ORACLE instance terminated. Disconnection forced." I traced the log file and got "ORA-00704: bootstrap process failure" and "ORA-39700: database must be opened with UPGRADE option." I don't understand why I have to upgrade and how? Thank you very much for your help.
The Oracle binary and library files are Oracle 10g, but internally, your database is still set up for Oracle 8i. Oracle recognizes this fact and will not let you open the database until you complete the upgrade process. This is pretty easy to do. Just follow these steps:

Modify your initialization parameter file to set your COMPATIBLE parameter to at least "9.2.0."

startup upgrade

Create a tablespace called SYSAUX that must be at least 500MB in size.

@?/rdbms/admin/catupgrd
shutdown immediate 
startup

The process above is called a manual upgrade and is fully documented here.

Your database must be Oracle 8.1.7 in order for the upgrade to work. If your database was 8.1.5 or 8.1.6, then you will need to upgrade to 8.1.7, 9.0.1 or 9.2.0 first before upgrading to Oracle 10g.

Dig Deeper on Oracle database backup and recovery

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