Oracle Solution for Error ora-01173

ORA-01173: data dictionary indicates missing data file from system tablespace

What triggered the Error:

Either the database has been recovered to a point in time in the future of the control file or a datafile from the system tablespace was omitted from the create control file command previously issued.

What should we do to fix it:

For the former problem you need to recover the database from a more recent control file. For the latter problem, simply recreate the control file checking to be sure that you include all the datafiles in the system tablespace.