Number of open files that can be used by the DB. You may need to increase this if your database has a large working set. Value -1 means files opened are always kept open. You can estimate number of files based on {@code target_file_size_base} and {@code target_file_size_multiplier}for level-based compaction. For universal-style compaction, you can usually set it to -1.
@return the maximum number of open files.
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