Install with previous version of the database, the installation directory selection is the same as before.
Turn off all services from Oracle.
Copy the database folder from the original Oracle_home directory to the current directory (it is a good idea to back up the current database folder).
Copy the Oradata, admin, Fgtoollogs, Flash_recovery_area folder under the original oracle_base, overwriting the current directory (please backup first).
Open the service.
Run command Sqlplus/as SYSDBA;
Run command shutdown
Run command startup
Restore success.
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This article is from the "oracle11g Recovery" blog, so be sure to keep this source http://51joblele.blog.51cto.com/9275297/1651920
oracle11g Database recovery After reinstalling the system (original Oracle installation directory is still in)