THE SESSION UPDATES THE COPY OF THE BLOCK IN MEMORY AND WRITES OUT THE CHANGE VECTOR TO THE LOG BUFFER
6.
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A. The session updates the copy of the block in memory and writes out
the change vector to the log buffer.
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B, C, and D. B is wrong, because while this will happen, it does not
happen when the change is made. C is wrong because it confuses the session
making changes in memory with LGWR propagating changes to disk. D is
wrong because all changes to data occur in memory as they are made—the
COMMIT is not relevant.