This is only one database instance (probably called "SMART"). What you see here are are just different filesystems, holding tablespaces, redo-logs and controlfiles.
A little explanation about what an Oracle database comprises. Sorry in advance if some parts are only vague. I am a Sysadmin, not a DBA, and have only a passing knowledge of databases:
An Oracle database (more correctly: database instance) first has space to store data and index them. This is the DB equivalent of a filesystem. It is called "tablespaces" and from an OS POV it is one or several file(s). Usually one creates - one or more - filesystem(s) for these files because if I/O issues arise one wants to be able to balance the I/O-operations across the involved hardware (disks, adapters, ...).
Where (in the filesystem) all these tablespaces are to be found, how big they are and several other information - name of the instance, used codepage, .... - is stored in a set of "controlfiles". In fact these files are created first when the instance is initially created. These control files are relatively small (just a few MB), but are vital to the operation of the database. Without a fitting set of control files backups of the tablespaces are unusable.
This all is completed by a third class of files: redo-logs. As the database is under load, data get stored in it. Every such transaction is written to the redo log as it happens. Once such a redo-log is full it is moved to a certain location and called "archive-log" and a new redo-log is started. It is possible to have several redo-logs and use them round-robin (seems to be the case here), but the principle is always the same. With these logs it is possible to either reverse already done transactions (="roll back") or, using a previous version of the tablespaces and reapplying the transactions to duplicate them (="roll forward"). The redo-log in principle consists of 4 informations for every transaction:
1) What was the data before the operation;
2) What was the data after the operation;
3) a timestamp;
4) a transaction-ID so that the succession of the transactions is distinct.
OK, so far a (very incomplete) introduction to Oracle workings.
What you can do to free space:
1) check the tablespaces. It might be that they are not full at all. It is possible to resize them, just like filesystems, thereby freeing space. By moving them around you can maybe empty one of the filesystems in use so that you can scratch it. Ask a DBA about how you do that inside Oracle, i just know this is possible but not how it is done.
2) check the archive logs. Archive-logs are not necessary for the running database. Backup them and remove them afterwards, freeing space. If this is not a productive DB instance you might not need them altogether. It is possible to switch off the loging completely, which is done typically in test instances and for initial loads of new database instances, so that archive-logs and redologs are not created at all.
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