RUN_... scripts fail if both Oracle and Postgres bin directories are on the path.
Surprisingly, both postgres and oracle use the same commands for createdb, dropbd. If both databases are installed on the same machine and the paths set to include both bin directories, which executable is called is ambiguous. The ADempiere scripts such as RUN_ImportAdempiere may fail.
This is only likely in a development environment. The users has to manage the path settings to avoid the problem. FYI only. I don't suggest fixing it.
Oracle and Postgres databases running on the same machine.