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Well, there are only so many files associated with database. Besides the one will be dropped by 'drop database' command, there's only those files under dump destination. Or perhaps the backup files depends backup method chosen, DBCA may or may not have knowledge of.
I would say the logical guess is DBCA will remove all files that will be created by DBCA. I seems remember one time I have to cancel a DBCA install, it will remove these files under bdump/cdump etc..
strace do not sound to be the best approach, as the datafiles are deleted by the server not by the client.
dbca for example should remove the entry in /etc/oratab, what drop database will not do.
I would prefer something like
find / -type f -ls > /tmp/before
dbca -silent -drop ...
find / -type f -ls > /tmp/after
diff /tmp/before /tmp/after
somehow it sounds more reliable than strace
.... - .... :)
from the book of «OCP - Oracle Database 10g Administration I», Chap 3. -- Using the DBCA to Delete a Database p 3 - 14
«Dropping a database involves removing its data files, redo log files, control files, and
initialization parameter files. The DROP DATABASE statement deletes all control files and all
other database files listed in the control file. To use the DROP DATABASE statement
successfully, all the following conditions must apply:
• The database must be mounted and closed.
• The database must be mounted exclusively—not in shared mode.
• The database must be mounted as RESTRICTED.
An example of this statement is:
The DROP DATABASE statement has no effect on archived log files nor does it have any effect
on copies or backups of the database. It is best to use Recovery Manager (RMAN) to delete such
files. If the database is on raw disks, then the actual raw disk special files are not deleted.»
there is no distinction between the DBCA Delete a database and the drop database statement.