ORA-00376: file 2 cannot be read at this time

ORA-01110: data file 2: ‘D:\ORACLE\ORADATA\ASSETMGT\UNDOTBS01.DBF’

 It looks like UNDOTABLESPACE problem.

If you have deleted the file or then you need to recover  this file is used for undo space.

Possible solutions are

1. Mount the database.

2. Check the status of the datafile.

3. Recover the datafile. (Do not use alter database, just RECOVER DATAFILE ‘FILESPEC’;

4. Bring datafile online

5. Bring the db up.