physical rowid represent one row in heap table(other table except IOT).
IOT(index organized table) use physical rowid to represet one row to fulfill the same usage. this rowid was calcuated by oracle by using some hash fucnion based on primary key
rowid impact after UML.
physical rowid isn't changed after DML update.
logical rowid is changed since the primary key changed.
rowid impact after table move/shrink space
physical rowid is changed
logical rowid is changed and the physical guess will become stale.