When installing oracle, AreasQueries cannot load databases.

1. Stop all Oracle services
2. delete the Oracle Installation Directory, which is mainly distributed in two places (such as the D disk and directory and the C disk program files). An error that cannot be deleted is prompted during deletion. Restart the machine and delete it again.
3. Delete contents in the Registry
HKEY_LOCAL_MACHINE/software deletes the Oracle directory
HKEY_LOCAL_MACHINE/system/CurrentControlSet/services key value starting with Oracle
Note: ensure that the Oracle installation directory cannot contain Chinese characters during installation.
If ArcSDE for Oracle is installed, You cannot delete the key value with the ArcSDE keyword When deleting the Oracle key value. Otherwise, ArcSDE may not run.

When installing Oracle, note that the source program path must not contain Chinese characters!