After the system is reinstalled, restore the original oracle file back.

The computer system crashed. The original XP system was installed with win7. the oracle database was not backed up before the reinstallation. The following describes how to restore the original database.

I checked it online and I have different opinions. Well, I just tried it myself. The result is successful and the database is completely restored.

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1. Back Up Files in the admin and oradata directories in the original oracle directory to other disks. (You only need to back up the database you need)

2. delete the files installed in oracle, install the new oracle in the same directory, and create a database instance with the same name as the original database.

3. Stop the services of the instance. Copy the backup files to overwrite the new ones.

4. Restart.

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Ps: Actually, it's very simple. Be brave to try it. Haha