8. þ C. A COMMIT is implemented by placing a COMMIT record in the log
buffer, and LGWR flushing the log buffer to disk.
ý A, B, and D. A is wrong because many of the change vectors (perhaps
all of them) will be on disk already. B is wrong because DBWn does not
participate in commit processing. D is wrong because the undo data may well
persist for some time; a COMMIT is not relevant to this.
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