13. þ A, C, and F. The necessary conditions are that the session must be able to
execute the UTL_FILE procedures, and that the UTL_FILE_DIR parameter must
point to a directory on which the Oracle user has the necessary permissions.
ý B, D, and E. B is wrong because DBMS_OUTPUT is used to write to the
user process, not to the operating system. D is wrong because DB_WRITER_
PROCESSES controls the number of database writers. E is wrong because
DB_CREATE_FILE_DEST sets a default location for datafiles.
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