Figure 4 and Figure 5 give examples to illustrate
the lifetime of the mirror transaction.
Figure 5. Function shipping--update. Because the mirror must wait
for the REWRITE, it does not terminate until SYNCPOINT is received. Note that
the enqueue on the updated record would not be held beyond the REWRITE command
if the file was not recoverable.
In Figure 5 the mirror is long-running.
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