Why the query of the object still can work after the datafile has been deleted?

Dear friends:
Recently, I deleted a datafile from OS but don't touch the correspondent tablespace in OEM(actually the datafile name still exists in OEM after I deleted it from OS). I found out I still can create objects such as table and query it in this tablespace using sqlplus though the physical datafile has already been deleted.(What I done is I created new objects using an account whose default tablespace is that one which I deleted the datafile from it.). Will these new objects use another datafile instead the original one deleted? I will appriciate if you can point out the reason for me. Thanks for your help!
John
07/26/2002

Even though you delete a datafile physically from OS, entries about the datafile still exists in Data Dictionary. So long as these entries are there in data dictionary, Oracle will consider that these file exists unless there is a specific command which referes to deleted files.
Further, you are trying to create table in a tablespace whose datafile is deleted. If that was the only datafile for that tablespace then you should get an error. If the table is getting created, there must be some other datafile for that tablespace, in which your table is getting created. This is all when your database is already in running stage. If you shutdown and restart the database, it won't start next time because of missing datafile.
Hope this solves your query.

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