13. When a DML statement executes, what happens? (Choose the best answer.)
A. Both the data and the undo blocks on disk are updated, and the changes
are written out to the redo stream.
B. The old version of the data is written to an undo segment, and the new
version is written to the data segments and the redo log buffer.
C. Both data and undo blocks are updated in the database buffer cache, and
the updates also go to the log buffer.
D. The redo log buffer is updated with information needed to redo the
transaction, and the undo blocks are updated with information needed to
reverse the transaction.
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