This error message comes if you are trying to perform an operation that needs database to be in mount state, however, the current state of the database in NOMOUNT. To explain further, if you are executing a statement that can only be run if database is in MOUNT state, or could either be in MOUNT or OPEN state, but database is only in nomount state, ORA-01507 will be returned. Following are a few examples where you can see ORA-01507 is being returned. And after mounting the database, error no longer appears.
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