Description
This function flushes the internals of the sditerator to
the data on disk. The default locking mode does that automatically
and so this normally will not need to be used. Some locking modes
do not do that. In that case, another process (e.g. an the table client)
may read data written through the sditerator. In that case, the
data in the sditerator may not be available to that other process
until it has been explicitly flushed to disk.
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