Since Oracle 8i, oracle physical rowid is in extended rowid format. Extended rowids show in 18 characters with base 64 encoding. The encoding characters are A-Z, a-z, 0-9, +, and /. It is stored in 10 bytes (80 bits).
An extended rowid has a four-piece format, OOOOOOFFFBBBBBBRRR:
The first 6 characters OOOOOO represent data object number, using [...]
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