Managing Oracle Tablespace (ORA-01653 error)

This procedure helped me a bit to manage an Oracle DB's tablespace. I was getting ORA-01653: unable to extend table SYSTEM... errors.

Maybe the following procedure is useful for others as well:

1. In order to manage/see the current usage, here's a good script posted by 'bipul' on http://forums.oracle.com/forums/thread.jspa?messageID=3590569
2. To check which data files are used:

   select name from v$datafile

3. To increase that setting:

alter database datafile 'C:\ORACLEXE\ORADATA\XE\SYSTEM.DBF' autoextend on next 100m maxsize 2000m;