[SQL] Found Large Files.. what objects are they?

[Yudie]

I found bunch of large files (more than 1 gb) in one of database directory. The files looks like this: 69233123 69233123.1 69233123.2 69233123.3 69233123.4 ...and so on.   These large files very delay the dumping process. Anyone know what it could be & how to delete the object related? How to find a table by oid?   Thanks   Yudie