db::StorageMode

buffer_count checkpoint_interval concurrency crypt file_mode flush_buffers open_flags page_size preallocate StorageMode

db::StorageMode::preallocate The number of journal pages to allocate when the journal becomes full. The default value is 10. Larger values improve performance at the cost of an increased journal size. See also: DB_MIN_PREALLOCATE_PAGES, DB_MAX_PREALLOCATE_PAGES, DB_DEF_PREALLOCATE_PAGES