ROWID
From Oracle FAQ
Every record has a unique ROWID within a database representing the physical location on disk where the record lives.
From Oracle 8 the ROWID format and size changed from 6 to 10 bytes. The Oracle 7 format is Block.Row.File. The Oracle 8 format is dataObjectNumber, block, row.
Note that ROWID's will change when you reorganize or export/import a table.
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